diff --git a/app/integrated_platform.pro b/app/integrated_platform.pro
index c960e66..c873520 100644
--- a/app/integrated_platform.pro
+++ b/app/integrated_platform.pro
@@ -21,6 +21,7 @@ SOURCES += \
     src/ui/alarm_configuration_dialog.cpp \
     src/ui/register_comment_dialog.cpp \
     src/ui/status_text_dialog.cpp \
+    src/ui/button_extension_dialog.cpp \
     src/ui/plc_connection_dialog.cpp \
     src/ui/free_monitor_widget.cpp \
     src/ui/runtime_monitor_window.cpp \
@@ -71,6 +72,7 @@ HEADERS += \
     src/ui/alarm_configuration_dialog.h \
     src/ui/register_comment_dialog.h \
     src/ui/status_text_dialog.h \
+    src/ui/button_extension_dialog.h \
     src/ui/plc_connection_dialog.h \
     src/ui/free_monitor_widget.h \
     src/ui/runtime_monitor_window.h \
@@ -127,6 +129,7 @@ FORMS += \
     src/ui/alarm_configuration_dialog.ui \
     src/ui/register_comment_dialog.ui \
     src/ui/status_text_dialog.ui \
+    src/ui/button_extension_dialog.ui \
     src/ui/plc_connection_dialog.ui \
     src/ui/free_monitor_widget.ui \
     src/ui/runtime_monitor_window.ui \
diff --git a/app/src/domain/hmi_model.cpp b/app/src/domain/hmi_model.cpp
index 38621ae..959ae19 100644
--- a/app/src/domain/hmi_model.cpp
+++ b/app/src/domain/hmi_model.cpp
@@ -7,6 +7,7 @@
 #include <cctype>
 #include <charconv>
 #include <cmath>
+#include <limits>
 
 namespace {
 
@@ -183,6 +184,77 @@ bool validateAppearanceProperty(
     return true;
 }
 
+bool validateButtonEnableCondition(
+    const HmiButtonEnableCondition &condition, std::string *error)
+{
+    if (const auto *bit = std::get_if<HmiButtonBitEnableCondition>(&condition))
+    {
+        if (!bit->address.isValid() || bit->address.area() != RegisterArea::M)
+        {
+            setError(error, "按钮 M 启用条件必须使用有效的 M 区地址");
+            return false;
+        }
+        return true;
+    }
+
+    const auto *word = std::get_if<HmiButtonWordEnableCondition>(&condition);
+    if (word == nullptr || !registerDataTypeIsSupported(word->dataType))
+    {
+        setError(error, "按钮 D 启用条件的数据类型无效");
+        return false;
+    }
+    switch (word->operation)
+    {
+    case HmiButtonConditionOperator::Equal:
+    case HmiButtonConditionOperator::NotEqual:
+    case HmiButtonConditionOperator::LessThan:
+    case HmiButtonConditionOperator::LessThanOrEqual:
+    case HmiButtonConditionOperator::GreaterThan:
+    case HmiButtonConditionOperator::GreaterThanOrEqual:
+        break;
+    default:
+        setError(error, "按钮 D 启用条件的比较方式无效");
+        return false;
+    }
+    if (!registerDataTypeAddressIsValid(word->dataType, word->address))
+    {
+        setError(error, "按钮 D 启用条件地址超出可用范围");
+        return false;
+    }
+    if (!std::isfinite(word->value))
+    {
+        setError(error, "按钮 D 启用条件比较值必须是有限数值");
+        return false;
+    }
+    if (word->dataType == RegisterDataType::Int16)
+    {
+        if (std::trunc(word->value) != word->value
+            || word->value < std::numeric_limits<std::int16_t>::min()
+            || word->value > std::numeric_limits<std::int16_t>::max())
+        {
+            setError(error, "Int16 按钮启用条件比较值必须是 -32768~32767 的整数");
+            return false;
+        }
+    }
+    else if (word->dataType == RegisterDataType::Int32)
+    {
+        if (std::trunc(word->value) != word->value
+            || word->value < std::numeric_limits<std::int32_t>::min()
+            || word->value > std::numeric_limits<std::int32_t>::max())
+        {
+            setError(error, "Int32 按钮启用条件比较值必须是有效的 32 位整数");
+            return false;
+        }
+    }
+    else if (word->dataType == RegisterDataType::Float32
+             && !std::isfinite(static_cast<float>(word->value)))
+    {
+        setError(error, "Float32 按钮启用条件比较值超出范围");
+        return false;
+    }
+    return true;
+}
+
 } // namespace
 
 bool HmiControl::validate(std::string *error) const
@@ -359,6 +431,19 @@ bool HmiControl::validate(std::string *error) const
         setError(error, "非页面跳转控件不能包含跳转配置");
         return false;
     }
+    if (type == HmiControlType::Button)
+    {
+        if (buttonEnableCondition.has_value()
+            && !validateButtonEnableCondition(*buttonEnableCondition, error))
+        {
+            return false;
+        }
+    }
+    else if (buttonEnableCondition.has_value())
+    {
+        setError(error, "非按钮控件不能包含按钮启用条件");
+        return false;
+    }
     return true;
 }
 
diff --git a/app/src/domain/hmi_model.h b/app/src/domain/hmi_model.h
index 7a746a9..e7547dc 100644
--- a/app/src/domain/hmi_model.h
+++ b/app/src/domain/hmi_model.h
@@ -72,6 +72,48 @@ enum class HmiButtonOperation
     MomentaryOn              // 按下时写入 1，释放时写入 0
 };
 
+/** @brief HMI 按钮 D 数值启用条件的比较方式 */
+enum class HmiButtonConditionOperator
+{
+    Equal,
+    NotEqual,
+    LessThan,
+    LessThanOrEqual,
+    GreaterThan,
+    GreaterThanOrEqual
+};
+
+struct HmiButtonBitEnableCondition
+{
+    RegisterAddress address{RegisterArea::M, 0};
+    bool expected = false;
+
+    bool operator==(const HmiButtonBitEnableCondition &other) const
+    {
+        return address == other.address && expected == other.expected;
+    }
+};
+
+struct HmiButtonWordEnableCondition
+{
+    RegisterAddress address{RegisterArea::D, 0};
+    RegisterDataType dataType = RegisterDataType::Int16;
+    HmiButtonConditionOperator operation = HmiButtonConditionOperator::Equal;
+    double value = 0.0;
+
+    bool operator==(const HmiButtonWordEnableCondition &other) const
+    {
+        return address == other.address
+            && dataType == other.dataType
+            && operation == other.operation
+            && value == other.value;
+    }
+};
+
+using HmiButtonEnableCondition = std::variant<
+    HmiButtonBitEnableCondition,
+    HmiButtonWordEnableCondition>;
+
 struct HmiPageJumpConfig
 {
     std::string targetPageId;
@@ -131,6 +173,7 @@ struct HmiControl
     RegisterDataType dataType = RegisterDataType::Int16;
     std::map<std::string, std::string> properties;
     HmiButtonOperation buttonOperation = HmiButtonOperation::MomentaryOn;
+    std::optional<HmiButtonEnableCondition> buttonEnableCondition;
     std::optional<HmiPageJumpConfig> pageJump;
     std::optional<HmiStatusTextConfig> statusText;
 
diff --git a/app/src/domain/project_model.h b/app/src/domain/project_model.h
index 70edfb6..04f3f67 100644
--- a/app/src/domain/project_model.h
+++ b/app/src/domain/project_model.h
@@ -26,7 +26,7 @@ struct ProjectMetadata
     // 工程显示名称
     std::string name;
     // 工程文件格式版本
-    std::string formatVersion = "3.0";
+    std::string formatVersion = "4.0";
 };
 
 // 聚合工程中的 HMI 页面、报警、寄存器注释和控制逻辑
diff --git a/app/src/infrastructure/json_project_storage.cpp b/app/src/infrastructure/json_project_storage.cpp
index 49fdfad..b45b87d 100644
--- a/app/src/infrastructure/json_project_storage.cpp
+++ b/app/src/infrastructure/json_project_storage.cpp
@@ -18,7 +18,7 @@
 namespace {
 
 // 当前读写实现支持的工程文件格式版本
-constexpr const char *kCurrentFormatVersion = "3.0";
+constexpr const char *kCurrentFormatVersion = "4.0";
 
 // 保存解析过程中遇到的第一个错误，避免后续失败覆盖根因
 struct ParseState
@@ -426,6 +426,156 @@ bool parseHmiButtonOperation(
     return true;
 }
 
+QString hmiButtonConditionOperatorName(HmiButtonConditionOperator operation)
+{
+    switch (operation)
+    {
+    case HmiButtonConditionOperator::Equal:
+        return QStringLiteral("equal");
+    case HmiButtonConditionOperator::NotEqual:
+        return QStringLiteral("notEqual");
+    case HmiButtonConditionOperator::LessThan:
+        return QStringLiteral("lessThan");
+    case HmiButtonConditionOperator::LessThanOrEqual:
+        return QStringLiteral("lessThanOrEqual");
+    case HmiButtonConditionOperator::GreaterThan:
+        return QStringLiteral("greaterThan");
+    case HmiButtonConditionOperator::GreaterThanOrEqual:
+        return QStringLiteral("greaterThanOrEqual");
+    default:
+        return {};
+    }
+}
+
+bool parseHmiButtonConditionOperator(
+    const std::string &value,
+    HmiButtonConditionOperator *operation,
+    ParseState *state)
+{
+    if (value == "equal")
+    {
+        *operation = HmiButtonConditionOperator::Equal;
+    }
+    else if (value == "notEqual")
+    {
+        *operation = HmiButtonConditionOperator::NotEqual;
+    }
+    else if (value == "lessThan")
+    {
+        *operation = HmiButtonConditionOperator::LessThan;
+    }
+    else if (value == "lessThanOrEqual")
+    {
+        *operation = HmiButtonConditionOperator::LessThanOrEqual;
+    }
+    else if (value == "greaterThan")
+    {
+        *operation = HmiButtonConditionOperator::GreaterThan;
+    }
+    else if (value == "greaterThanOrEqual")
+    {
+        *operation = HmiButtonConditionOperator::GreaterThanOrEqual;
+    }
+    else
+    {
+        return state->fail(
+            ProjectStorageError::InvalidField,
+            "不支持的按钮 D 启用条件比较方式：" + value);
+    }
+    return true;
+}
+
+QJsonObject serializeHmiButtonEnableCondition(
+    const HmiButtonEnableCondition &condition)
+{
+    QJsonObject object;
+    if (const auto *bit = std::get_if<HmiButtonBitEnableCondition>(&condition))
+    {
+        object.insert(QStringLiteral("type"), QStringLiteral("mBit"));
+        object.insert(QStringLiteral("address"), serializeAddress(bit->address));
+        object.insert(QStringLiteral("expected"), bit->expected);
+        return object;
+    }
+
+    const auto &word = std::get<HmiButtonWordEnableCondition>(condition);
+    object.insert(QStringLiteral("type"), QStringLiteral("dValue"));
+    object.insert(QStringLiteral("address"), serializeAddress(word.address));
+    object.insert(
+        QStringLiteral("dataType"),
+        QString::fromLatin1(registerDataTypeName(word.dataType)));
+    object.insert(
+        QStringLiteral("operation"),
+        hmiButtonConditionOperatorName(word.operation));
+    object.insert(QStringLiteral("value"), word.value);
+    return object;
+}
+
+bool parseHmiButtonEnableCondition(
+    const QJsonObject &object,
+    const std::string &context,
+    HmiButtonEnableCondition *condition,
+    ParseState *state)
+{
+    std::string type;
+    QJsonObject address_object;
+    if (!readString(object, "type", context, &type, state)
+        || !readObject(object, "address", context, &address_object, state))
+    {
+        return false;
+    }
+    RegisterAddress address{RegisterArea::M, 0};
+    if (!parseAddress(address_object, context + ".address", &address, state))
+    {
+        return false;
+    }
+    if (type == "mBit")
+    {
+        bool expected = false;
+        if (!readBool(object, "expected", context, &expected, state))
+        {
+            return false;
+        }
+        *condition = HmiButtonBitEnableCondition{address, expected};
+        return true;
+    }
+    if (type != "dValue")
+    {
+        return state->fail(
+            ProjectStorageError::InvalidField,
+            context + ".type 必须是 mBit 或 dValue");
+    }
+    std::string data_type_text;
+    std::string operation_text;
+    QJsonValue value_json;
+    if (!readString(object, "dataType", context, &data_type_text, state)
+        || !readString(object, "operation", context, &operation_text, state)
+        || !readValue(object, "value", context, &value_json, state))
+    {
+        return false;
+    }
+    RegisterDataType data_type = RegisterDataType::Int16;
+    if (!parseRegisterDataType(data_type_text, &data_type))
+    {
+        return state->fail(
+            ProjectStorageError::InvalidField,
+            context + ".dataType 必须是 int16、int32、float32 或 float64");
+    }
+    if (!value_json.isDouble() || !std::isfinite(value_json.toDouble()))
+    {
+        return state->fail(
+            ProjectStorageError::InvalidField,
+            context + ".value 必须是有限数值");
+    }
+    HmiButtonConditionOperator operation = HmiButtonConditionOperator::Equal;
+    if (!parseHmiButtonConditionOperator(operation_text, &operation, state))
+    {
+        return false;
+    }
+    *condition = HmiButtonWordEnableCondition{
+        address, data_type, operation, value_json.toDouble()};
+    return true;
+}
+
 QString alarmConditionName(AlarmCondition condition)
 {
     switch (condition)
@@ -810,6 +960,11 @@ QJsonObject serializeHmiControl(const HmiControl &control)
         object.insert(
             QStringLiteral("buttonOperation"),
             hmiButtonOperationName(control.buttonOperation));
+        object.insert(
+            QStringLiteral("buttonEnableCondition"),
+            control.buttonEnableCondition.has_value()
+                ? serializeHmiButtonEnableCondition(*control.buttonEnableCondition)
+                : QJsonValue(QJsonValue::Null));
     }
     if (control.type == HmiControlType::PageJump)
     {
@@ -889,6 +1044,7 @@ bool parseHmiControl(
     if (control->type == HmiControlType::Button)
     {
         std::string operation_text;
+        QJsonValue enable_condition_value;
         if (!readString(
                 object,
                 "buttonOperation",
@@ -900,6 +1056,38 @@ bool parseHmiControl(
         {
             return false;
         }
+        if (!readValue(
+                object,
+                "buttonEnableCondition",
+                context,
+                &enable_condition_value,
+                state))
+        {
+            return false;
+        }
+        if (enable_condition_value.isNull())
+        {
+            control->buttonEnableCondition.reset();
+        }
+        else if (!enable_condition_value.isObject())
+        {
+            return state->fail(
+                ProjectStorageError::InvalidField,
+                context + ".buttonEnableCondition 必须是对象或 null");
+        }
+        else
+        {
+            HmiButtonEnableCondition condition;
+            if (!parseHmiButtonEnableCondition(
+                    enable_condition_value.toObject(),
+                    context + ".buttonEnableCondition",
+                    &condition,
+                    state))
+            {
+                return false;
+            }
+            control->buttonEnableCondition = std::move(condition);
+        }
     }
     if (control->type == HmiControlType::PageJump)
     {
diff --git a/app/src/infrastructure/json_project_storage.h b/app/src/infrastructure/json_project_storage.h
index b6d9c64..3339f17 100644
--- a/app/src/infrastructure/json_project_storage.h
+++ b/app/src/infrastructure/json_project_storage.h
@@ -2,7 +2,7 @@
 
 #include "domain/project_storage.h"
 
-// 严格读写当前 3.0 JSON 工程格式
+// 严格读写当前 4.0 JSON 工程格式
 class JsonProjectStorage final : public ProjectStorage
 {
 public:
diff --git a/app/src/services/hmi_editor_service.cpp b/app/src/services/hmi_editor_service.cpp
index 197ba20..67b2a04 100644
--- a/app/src/services/hmi_editor_service.cpp
+++ b/app/src/services/hmi_editor_service.cpp
@@ -137,6 +137,7 @@ bool HmiEditorService::controlsEqual(
         && left.dataType == right.dataType
         && left.properties == right.properties
         && left.buttonOperation == right.buttonOperation
+        && left.buttonEnableCondition == right.buttonEnableCondition
         && left.statusText == right.statusText
         && page_jump_equal;
 }
diff --git a/app/src/services/hmi_runtime_service.cpp b/app/src/services/hmi_runtime_service.cpp
index bdb4798..bddf976 100644
--- a/app/src/services/hmi_runtime_service.cpp
+++ b/app/src/services/hmi_runtime_service.cpp
@@ -29,6 +29,28 @@ double numericValueAsDouble(const RegisterNumericValue &value)
         value);
 }
 
+bool compareButtonValue(
+    double actual, HmiButtonConditionOperator operation, double expected)
+{
+    switch (operation)
+    {
+    case HmiButtonConditionOperator::Equal:
+        return actual == expected;
+    case HmiButtonConditionOperator::NotEqual:
+        return actual != expected;
+    case HmiButtonConditionOperator::LessThan:
+        return actual < expected;
+    case HmiButtonConditionOperator::LessThanOrEqual:
+        return actual <= expected;
+    case HmiButtonConditionOperator::GreaterThan:
+        return actual > expected;
+    case HmiButtonConditionOperator::GreaterThanOrEqual:
+        return actual >= expected;
+    default:
+        return false;
+    }
+}
+
 } // namespace
 
 HmiRuntimeService::HmiRuntimeService(RegisterRepository &repository)
@@ -177,6 +199,74 @@ HmiStatusTextReadResult HmiRuntimeService::readStatusText(
             true, HmiRuntimeError::None, match->text};
 }
 
+HmiButtonEnabledResult HmiRuntimeService::evaluateButtonEnabled(
+    const HmiControl &control) const
+{
+    if (control.type != HmiControlType::Button)
+    {
+        return {false, false, HmiRuntimeError::UnsupportedControl};
+    }
+    if (!control.buttonEnableCondition.has_value())
+    {
+        return {true, true, HmiRuntimeError::None};
+    }
+    if (const auto *bit = std::get_if<HmiButtonBitEnableCondition>(
+            &*control.buttonEnableCondition))
+    {
+        if (!bit->address.isValid() || bit->address.area() != RegisterArea::M)
+        {
+            return {false, false, HmiRuntimeError::ConditionUnavailable};
+        }
+        const BitReadResult result = repository_.readBit(bit->address);
+        if (!result.succeeded)
+        {
+            return {false, false, HmiRuntimeError::ConditionUnavailable};
+        }
+        return {true,
+                result.value == bit->expected,
+                result.value == bit->expected
+                    ? HmiRuntimeError::None : HmiRuntimeError::ConditionNotMet};
+    }
+
+    const auto *word = std::get_if<HmiButtonWordEnableCondition>(
+        &*control.buttonEnableCondition);
+    if (word == nullptr
+        || !registerDataTypeAddressIsValid(word->dataType, word->address)
+        || !std::isfinite(word->value))
+    {
+        return {false, false, HmiRuntimeError::ConditionUnavailable};
+    }
+    switch (word->operation)
+    {
+    case HmiButtonConditionOperator::Equal:
+    case HmiButtonConditionOperator::NotEqual:
+    case HmiButtonConditionOperator::LessThan:
+    case HmiButtonConditionOperator::LessThanOrEqual:
+    case HmiButtonConditionOperator::GreaterThan:
+    case HmiButtonConditionOperator::GreaterThanOrEqual:
+        break;
+    default:
+        return {false, false, HmiRuntimeError::ConditionUnavailable};
+    }
+    const WordsReadResult words = repository_.readWords(
+        word->address, registerDataTypeWordCount(word->dataType));
+    if (!words.succeeded)
+    {
+        return {false, false, HmiRuntimeError::ConditionUnavailable};
+    }
+    const std::optional<RegisterNumericValue> value =
+        decodeRegisterNumericValue(word->dataType, words.values);
+    if (!value.has_value())
+    {
+        return {false, false, HmiRuntimeError::ConditionUnavailable};
+    }
+    const bool enabled = compareButtonValue(
+        numericValueAsDouble(*value), word->operation, word->value);
+    return {true,
+            enabled,
+            enabled ? HmiRuntimeError::None : HmiRuntimeError::ConditionNotMet};
+}
+
 HmiRuntimeWriteResult HmiRuntimeService::operateButton(
     const HmiControl &control, HmiButtonEvent event)
 {
@@ -193,6 +283,19 @@ HmiRuntimeWriteResult HmiRuntimeService::operateButton(
         return writeFailure(HmiRuntimeError::InvalidBinding);
     }
 
+    if (event == HmiButtonEvent::Pressed)
+    {
+        const HmiButtonEnabledResult enabled = evaluateButtonEnabled(control);
+        if (!enabled.succeeded)
+        {
+            return writeFailure(enabled.error);
+        }
+        if (!enabled.enabled)
+        {
+            return writeFailure(HmiRuntimeError::ConditionNotMet);
+        }
+    }
+
     bool value = false;
     switch (control.buttonOperation)
     {
diff --git a/app/src/services/hmi_runtime_service.h b/app/src/services/hmi_runtime_service.h
index 8a01f49..f3f499b 100644
--- a/app/src/services/hmi_runtime_service.h
+++ b/app/src/services/hmi_runtime_service.h
@@ -21,7 +21,9 @@ enum class HmiRuntimeError
     UnsupportedControl, // 控件类型不支持寄存器读写或写入操作
     MissingBinding, // 控件未配置寄存器绑定
     InvalidBinding, // 控件绑定地址无效或地址区域不匹配
-    RepositoryFailure // 寄存器仓库不可用或拒绝读写
+    RepositoryFailure, // 寄存器仓库不可用或拒绝读写
+    ConditionNotMet, // 按钮启用条件不满足
+    ConditionUnavailable // 按钮启用条件无法读取或配置无效
 };
 
 /**
@@ -46,6 +48,13 @@ struct HmiRuntimeWriteResult
     HmiRuntimeError error = HmiRuntimeError::None; // 失败时的 HMI 错误分类
 };
 
+struct HmiButtonEnabledResult
+{
+    bool succeeded = false;
+    bool enabled = false;
+    HmiRuntimeError error = HmiRuntimeError::ConditionUnavailable;
+};
+
 struct HmiStatusTextReadResult
 {
     bool succeeded = false;
@@ -86,6 +95,9 @@ public:
      */
     HmiRuntimeReadResult readControl(const HmiControl &control) const;
     HmiStatusTextReadResult readStatusText(const HmiControl &control) const;
+    /** @brief 读取并评估按钮启用条件；无条件按钮直接返回可用 */
+    HmiButtonEnabledResult evaluateButtonEnabled(
+        const HmiControl &control) const;
     /**
      * @brief 根据按钮配置处理按下或释放事件
      * @param control 按钮控件，必须绑定有效 M 地址
diff --git a/app/src/services/project_service.cpp b/app/src/services/project_service.cpp
index efd7b0f..561dc1a 100644
--- a/app/src/services/project_service.cpp
+++ b/app/src/services/project_service.cpp
@@ -192,7 +192,7 @@ Project ProjectService::makeNewProject(const std::string &name)
     project.metadata.id = generateProjectId();
     project.metadata.name = name;
     // 新工程固定使用当前存储格式版本
-    project.metadata.formatVersion = "3.0";
+    project.metadata.formatVersion = "4.0";
     return project;
 }
 
diff --git a/app/src/services/runtime_mode_service.cpp b/app/src/services/runtime_mode_service.cpp
index f6f1a8b..714a510 100644
--- a/app/src/services/runtime_mode_service.cpp
+++ b/app/src/services/runtime_mode_service.cpp
@@ -339,6 +339,33 @@ PlcCommunicationResult RuntimeModeService::refreshPlcPollAddresses()
                     }
                 }
             }
+            if (control.type == HmiControlType::Button
+                && control.buttonEnableCondition.has_value())
+            {
+                if (const auto *bit = std::get_if<
+                        HmiButtonBitEnableCondition>(
+                        &*control.buttonEnableCondition))
+                {
+                    addresses.push_back(bit->address);
+                }
+                else if (const auto *word = std::get_if<
+                             HmiButtonWordEnableCondition>(
+                             &*control.buttonEnableCondition))
+                {
+                    addresses.push_back(word->address);
+                    const int word_count = registerDataTypeWordCount(
+                        word->dataType);
+                    for (int offset = 1; offset < word_count; ++offset)
+                    {
+                        addresses.push_back(RegisterAddress{
+                            RegisterArea::D, word->address.index() + offset});
+                    }
+                    if (word_count > 1)
+                    {
+                        multi_word_ranges.push_back({word->address, word_count});
+                    }
+                }
+            }
         }
     }
     for (const AlarmDefinition &definition : project.alarmDefinitions)
diff --git a/app/src/ui/button_extension_dialog.cpp b/app/src/ui/button_extension_dialog.cpp
new file mode 100644
index 0000000..61ed8b7
--- /dev/null
+++ b/app/src/ui/button_extension_dialog.cpp
@@ -0,0 +1,124 @@
+#include "button_extension_dialog.h"
+
+#include "domain/project_limits.h"
+#include "ui_button_extension_dialog.h"
+
+#include <QComboBox>
+#include <QLineEdit>
+#include <QLocale>
+#include <QMessageBox>
+
+namespace {
+
+QString fromUtf8(const std::string &value)
+{
+    return QString::fromUtf8(value.data(), static_cast<int>(value.size()));
+}
+
+} // namespace
+
+ButtonExtensionDialog::ButtonExtensionDialog(
+    const HmiControl &control, QWidget *parent)
+    : QDialog(parent),
+      ui_(std::make_unique<Ui::ButtonExtensionDialog>()),
+      control_(control)
+{
+    ui_->setupUi(this);
+    ui_->conditionTypeComboBox->setItemData(0, 0);
+    ui_->conditionTypeComboBox->setItemData(1, 1);
+    ui_->conditionTypeComboBox->setItemData(2, 2);
+    ui_->dataTypeComboBox->setItemData(0, static_cast<int>(RegisterDataType::Int16));
+    ui_->dataTypeComboBox->setItemData(1, static_cast<int>(RegisterDataType::Int32));
+    ui_->dataTypeComboBox->setItemData(2, static_cast<int>(RegisterDataType::Float32));
+    ui_->dataTypeComboBox->setItemData(3, static_cast<int>(RegisterDataType::Float64));
+    ui_->operatorComboBox->setItemData(0, static_cast<int>(HmiButtonConditionOperator::Equal));
+    ui_->operatorComboBox->setItemData(1, static_cast<int>(HmiButtonConditionOperator::NotEqual));
+    ui_->operatorComboBox->setItemData(2, static_cast<int>(HmiButtonConditionOperator::LessThan));
+    ui_->operatorComboBox->setItemData(3, static_cast<int>(HmiButtonConditionOperator::LessThanOrEqual));
+    ui_->operatorComboBox->setItemData(4, static_cast<int>(HmiButtonConditionOperator::GreaterThan));
+    ui_->operatorComboBox->setItemData(5, static_cast<int>(HmiButtonConditionOperator::GreaterThanOrEqual));
+    ui_->addressSpinBox->setRange(0, RegisterAddress::kMaximumIndex);
+    ui_->dAddressSpinBox->setRange(0, RegisterAddress::kMaximumIndex);
+
+    if (control.buttonEnableCondition.has_value())
+    {
+        if (const auto *bit = std::get_if<HmiButtonBitEnableCondition>(
+                &*control.buttonEnableCondition))
+        {
+            ui_->conditionTypeComboBox->setCurrentIndex(1);
+            ui_->addressSpinBox->setValue(bit->address.index());
+            ui_->expectedComboBox->setCurrentIndex(bit->expected ? 1 : 0);
+        }
+        else if (const auto *word = std::get_if<HmiButtonWordEnableCondition>(
+                     &*control.buttonEnableCondition))
+        {
+            ui_->conditionTypeComboBox->setCurrentIndex(2);
+            ui_->dAddressSpinBox->setValue(word->address.index());
+            ui_->dataTypeComboBox->setCurrentIndex(
+                ui_->dataTypeComboBox->findData(static_cast<int>(word->dataType)));
+            ui_->operatorComboBox->setCurrentIndex(
+                ui_->operatorComboBox->findData(static_cast<int>(word->operation)));
+            ui_->valueEdit->setText(QLocale::c().toString(word->value, 'g', 17));
+        }
+    }
+    connect(ui_->conditionTypeComboBox,
+            QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &ButtonExtensionDialog::updateConditionPage);
+    updateConditionPage();
+}
+
+ButtonExtensionDialog::~ButtonExtensionDialog() = default;
+
+const HmiControl &ButtonExtensionDialog::control() const
+{
+    return control_;
+}
+
+void ButtonExtensionDialog::updateConditionPage()
+{
+    const int type = ui_->conditionTypeComboBox->currentData().toInt();
+    ui_->configurationStack->setCurrentIndex(type == 2 ? 1 : 0);
+    ui_->bitPage->setEnabled(type == 1);
+    ui_->wordPage->setEnabled(type == 2);
+}
+
+void ButtonExtensionDialog::accept()
+{
+    const int type = ui_->conditionTypeComboBox->currentData().toInt();
+    if (type == 0)
+    {
+        control_.buttonEnableCondition.reset();
+    }
+    else if (type == 1)
+    {
+        control_.buttonEnableCondition = HmiButtonBitEnableCondition{
+            RegisterAddress{RegisterArea::M, ui_->addressSpinBox->value()},
+            ui_->expectedComboBox->currentData().toInt() != 0};
+    }
+    else
+    {
+        bool converted = false;
+        const double value = QLocale::c().toDouble(
+            ui_->valueEdit->text().trimmed(), &converted);
+        if (!converted)
+        {
+            QMessageBox::warning(this, tr("按钮扩展配置"),
+                                 tr("D 条件比较值必须是有限数值"));
+            return;
+        }
+        control_.buttonEnableCondition = HmiButtonWordEnableCondition{
+            RegisterAddress{RegisterArea::D, ui_->dAddressSpinBox->value()},
+            static_cast<RegisterDataType>(ui_->dataTypeComboBox->currentData().toInt()),
+            static_cast<HmiButtonConditionOperator>(
+                ui_->operatorComboBox->currentData().toInt()),
+            value};
+    }
+
+    std::string error;
+    if (!control_.validate(&error))
+    {
+        QMessageBox::warning(this, tr("按钮扩展配置"), fromUtf8(error));
+        return;
+    }
+    QDialog::accept();
+}
diff --git a/app/src/ui/button_extension_dialog.h b/app/src/ui/button_extension_dialog.h
new file mode 100644
index 0000000..ab9844c
--- /dev/null
+++ b/app/src/ui/button_extension_dialog.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include "domain/hmi_model.h"
+
+#include <QDialog>
+
+#include <memory>
+
+namespace Ui {
+class ButtonExtensionDialog;
+}
+
+class ButtonExtensionDialog final : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit ButtonExtensionDialog(const HmiControl &control, QWidget *parent = nullptr);
+    ~ButtonExtensionDialog() override;
+
+    const HmiControl &control() const;
+
+private slots:
+    void updateConditionPage();
+    void accept() override;
+
+private:
+    std::unique_ptr<Ui::ButtonExtensionDialog> ui_;
+    HmiControl control_;
+};
diff --git a/app/src/ui/button_extension_dialog.ui b/app/src/ui/button_extension_dialog.ui
new file mode 100644
index 0000000..5c94f19
--- /dev/null
+++ b/app/src/ui/button_extension_dialog.ui
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ButtonExtensionDialog</class>
+ <widget class="QDialog" name="ButtonExtensionDialog">
+  <property name="windowTitle"><string>按钮扩展配置</string></property>
+  <property name="minimumSize"><size><width>460</width><height>260</height></size></property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <layout class="QFormLayout" name="conditionForm">
+     <item row="0" column="0"><widget class="QLabel" name="conditionTypeLabel"><property name="text"><string>启用条件</string></property></widget></item>
+     <item row="0" column="1"><widget class="QComboBox" name="conditionTypeComboBox"><item><property name="text"><string>未设置</string></property></item><item><property name="text"><string>M 位条件</string></property></item><item><property name="text"><string>D 数值条件</string></property></item></widget></item>
+    </layout>
+   </item>
+   <item><widget class="QStackedWidget" name="configurationStack">
+    <widget class="QWidget" name="bitPage"><layout class="QFormLayout" name="bitForm">
+     <item row="0" column="0"><widget class="QLabel" name="addressLabel"><property name="text"><string>M 地址</string></property></widget></item>
+     <item row="0" column="1"><widget class="QSpinBox" name="addressSpinBox"><property name="maximum"><number>4000</number></property></widget></item>
+     <item row="1" column="0"><widget class="QLabel" name="expectedLabel"><property name="text"><string>要求状态</string></property></widget></item>
+     <item row="1" column="1"><widget class="QComboBox" name="expectedComboBox"><item><property name="text"><string>OFF</string></property><property name="userData"><bool>false</bool></property></item><item><property name="text"><string>ON</string></property><property name="userData"><bool>true</bool></property></item></widget></item>
+    </layout></widget>
+    <widget class="QWidget" name="wordPage"><layout class="QFormLayout" name="wordForm">
+     <item row="0" column="0"><widget class="QLabel" name="dAddressLabel"><property name="text"><string>D 地址</string></property></widget></item>
+     <item row="0" column="1"><widget class="QSpinBox" name="dAddressSpinBox"><property name="maximum"><number>4000</number></property></widget></item>
+     <item row="1" column="0"><widget class="QLabel" name="dataTypeLabel"><property name="text"><string>数值类型</string></property></widget></item>
+     <item row="1" column="1"><widget class="QComboBox" name="dataTypeComboBox"><item><property name="text"><string>Int16</string></property></item><item><property name="text"><string>Int32</string></property></item><item><property name="text"><string>Float32</string></property></item><item><property name="text"><string>Double (Float64)</string></property></item></widget></item>
+     <item row="2" column="0"><widget class="QLabel" name="operatorLabel"><property name="text"><string>比较方式</string></property></widget></item>
+     <item row="2" column="1"><widget class="QComboBox" name="operatorComboBox"><item><property name="text"><string>等于</string></property></item><item><property name="text"><string>不等于</string></property></item><item><property name="text"><string>小于</string></property></item><item><property name="text"><string>小于等于</string></property></item><item><property name="text"><string>大于</string></property></item><item><property name="text"><string>大于等于</string></property></item></widget></item>
+     <item row="3" column="0"><widget class="QLabel" name="valueLabel"><property name="text"><string>比较值</string></property></widget></item>
+     <item row="3" column="1"><widget class="QLineEdit" name="valueEdit"><property name="placeholderText"><string>请输入数值</string></property></widget></item>
+    </layout></widget>
+   </widget></item>
+   <item><widget class="QDialogButtonBox" name="buttonBox"><property name="standardButtons"><set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set></property></widget></item>
+  </layout>
+ </widget>
+ <connections><connection><sender>buttonBox</sender><signal>accepted()</signal><receiver>ButtonExtensionDialog</receiver><slot>accept()</slot></connection><connection><sender>buttonBox</sender><signal>rejected()</signal><receiver>ButtonExtensionDialog</receiver><slot>reject()</slot></connection></connections>
+</ui>
diff --git a/app/src/ui/hmi_editor_widget.cpp b/app/src/ui/hmi_editor_widget.cpp
index d1adc47..982f126 100644
--- a/app/src/ui/hmi_editor_widget.cpp
+++ b/app/src/ui/hmi_editor_widget.cpp
@@ -199,7 +199,7 @@ public:
         case HmiControlType::Button:
         {
             const bool disabled = !editing_enabled_ && runtime_active_
-                && !runtime_write_enabled_;
+                && (!runtime_write_enabled_ || !button_condition_enabled_);
             const QColor fill = disabled
                 ? QColor(QStringLiteral("#e2e6e4"))
                 : button_pressed_ ? QColor(QStringLiteral("#a9cbb6"))
@@ -454,6 +454,7 @@ public:
     void setInteractionState(
         bool editable, bool runtime_active, bool runtime_write_enabled)
     {
+        const bool runtime_was_active = runtime_active_;
         if (control_.type == HmiControlType::AlarmList && !runtime_active)
         {
             alarm_page_ = 0U;
@@ -461,6 +462,14 @@ public:
         editing_enabled_ = editable;
         runtime_active_ = runtime_active;
         runtime_write_enabled_ = runtime_active && runtime_write_enabled;
+        if (runtime_active_ && !runtime_was_active)
+        {
+            button_condition_enabled_ = false;
+        }
+        else if (!runtime_active_)
+        {
+            button_condition_enabled_ = false;
+        }
         setFlag(ItemIsMovable, editable);
         setFlag(ItemIsSelectable, editable);
         if (!editable)
@@ -473,15 +482,20 @@ public:
                 || control_.type == HmiControlType::NumericInput
                 || control_.type == HmiControlType::PageJump
                 || control_.type == HmiControlType::AlarmList);
+        const bool runtime_write_input_enabled = control_.type
+            == HmiControlType::Button
+            ? runtime_write_enabled_ && button_condition_enabled_
+            : runtime_write_enabled_;
         const bool runtime_input_enabled = runtime_input
             && (control_.type == HmiControlType::PageJump
                 || control_.type == HmiControlType::AlarmList
-                || runtime_write_enabled_);
+                || runtime_write_input_enabled);
         setAcceptedMouseButtons(
             editable || runtime_input_enabled ? Qt::LeftButton : Qt::NoButton);
 
         const bool runtime_button_enabled = runtime_active_
-            && control_.type == HmiControlType::Button && runtime_write_enabled_;
+            && control_.type == HmiControlType::Button && runtime_write_enabled_
+            && button_condition_enabled_;
         const bool runtime_page_jump_enabled = runtime_active_
             && control_.type == HmiControlType::PageJump;
         const bool runtime_alarm_enabled = runtime_active_
@@ -497,7 +511,10 @@ public:
             unsetCursor();
             button_hovered_ = false;
             page_hovered_ = false;
-            button_pressed_ = false;
+            if (!runtime_active_ || !runtime_write_enabled_)
+            {
+                button_pressed_ = false;
+            }
         }
         update();
     }
@@ -512,6 +529,13 @@ public:
         update();
     }
 
+    void setButtonConditionEnabled(bool enabled)
+    {
+        button_condition_enabled_ = enabled;
+        setInteractionState(
+            editing_enabled_, runtime_active_, runtime_write_enabled_);
+    }
+
     void setStatusText(const std::string &text, bool available)
     {
         status_text_ = QString::fromUtf8(
@@ -606,6 +630,7 @@ protected:
             return;
         }
         if (runtime_active_ && runtime_write_enabled_
+            && button_condition_enabled_
             && control_.type == HmiControlType::Button && button_event_)
         {
             button_pressed_ = true;
@@ -887,6 +912,7 @@ private:
     bool editing_enabled_ = true;
     bool runtime_active_ = false;
     bool runtime_write_enabled_ = false;
+    bool button_condition_enabled_ = true;
     bool button_hovered_ = false;
     bool button_pressed_ = false;
     bool page_hovered_ = false;
@@ -1135,6 +1161,13 @@ void HmiEditorWidget::refreshRuntimeValues()
             control_item->setAlarmRecords(alarm_service_.records());
             continue;
         }
+        if (control->type == HmiControlType::Button)
+        {
+            const HmiButtonEnabledResult enabled =
+                runtime_service_.evaluateButtonEnabled(*control);
+            control_item->setButtonConditionEnabled(
+                enabled.succeeded && enabled.enabled);
+        }
         if (control->type == HmiControlType::StatusText)
         {
             const HmiStatusTextReadResult value =
@@ -1229,6 +1262,12 @@ void HmiEditorWidget::handleButtonEvent(
     const HmiRuntimeWriteResult result = runtime_service_.operateButton(*control, event);
     if (!result.succeeded)
     {
+        if (result.error == HmiRuntimeError::ConditionNotMet
+            || result.error == HmiRuntimeError::ConditionUnavailable)
+        {
+            refreshRuntimeValues();
+            return;
+        }
         emit editorError(tr("寄存器操作失败"));
         return;
     }
diff --git a/app/src/ui/main_window.ui b/app/src/ui/main_window.ui
index 05bd0d0..28e4cae 100644
--- a/app/src/ui/main_window.ui
+++ b/app/src/ui/main_window.ui
@@ -706,13 +706,23 @@
                </widget>
               </item>
               <item row="10" column="0">
+               <widget class="QLabel" name="buttonEnableConditionLabel">
+                <property name="text"><string>启用条件</string></property>
+               </widget>
+              </item>
+              <item row="10" column="1">
+               <widget class="QPushButton" name="configureButtonExtensionButton">
+                <property name="text"><string>未设置</string></property>
+               </widget>
+              </item>
+              <item row="11" column="0">
                <widget class="QLabel" name="textColorLabel">
                 <property name="text">
                  <string>字体颜色</string>
                 </property>
                </widget>
               </item>
-              <item row="10" column="1">
+              <item row="11" column="1">
                <widget class="QWidget" name="textColorContainer">
                 <layout class="QHBoxLayout" name="textColorLayout">
                  <property name="leftMargin"><number>0</number></property>
@@ -736,24 +746,24 @@
                 </layout>
                </widget>
               </item>
-              <item row="11" column="0">
+              <item row="12" column="0">
                <widget class="QLabel" name="fontSizeLabel">
                 <property name="text">
                  <string>字号</string>
                 </property>
                </widget>
               </item>
-              <item row="11" column="1">
+              <item row="12" column="1">
                <widget class="QSpinBox" name="fontSizeSpinBox"/>
               </item>
-              <item row="12" column="0">
+              <item row="13" column="0">
                <widget class="QLabel" name="fontBoldLabel">
                 <property name="text">
                  <string>字体样式</string>
                 </property>
                </widget>
               </item>
-              <item row="12" column="1">
+              <item row="13" column="1">
                <widget class="QWidget" name="fontStyleContainer">
                 <layout class="QHBoxLayout" name="fontStyleLayout">
                  <property name="leftMargin"><number>0</number></property>
@@ -773,12 +783,12 @@
                 </layout>
                </widget>
               </item>
-              <item row="13" column="0">
+              <item row="14" column="0">
                <widget class="QLabel" name="dataTypeLabel">
                 <property name="text"><string>数值类型</string></property>
                </widget>
               </item>
-              <item row="13" column="1">
+              <item row="14" column="1">
                 <widget class="QComboBox" name="dataTypeComboBox">
                  <item><property name="text"><string>Int16</string></property></item>
                  <item><property name="text"><string>Int32</string></property></item>
@@ -786,17 +796,17 @@
                  <item><property name="text"><string>Double (Float64)</string></property></item>
                 </widget>
               </item>
-              <item row="14" column="0">
+              <item row="15" column="0">
                <widget class="QLabel" name="statusTextConfigLabel">
                 <property name="text"><string>状态映射</string></property>
                </widget>
               </item>
-              <item row="14" column="1">
+              <item row="15" column="1">
                <widget class="QPushButton" name="configureStatusTextButton">
                 <property name="text"><string>配置</string></property>
                </widget>
               </item>
-              <item row="15" column="0" colspan="2">
+              <item row="16" column="0" colspan="2">
                <widget class="QPushButton" name="applyPropertiesButton">
                <property name="text">
                 <string>应用属性</string>
diff --git a/app/src/ui/property_panel_controller.cpp b/app/src/ui/property_panel_controller.cpp
index 4890758..1e6c3bc 100644
--- a/app/src/ui/property_panel_controller.cpp
+++ b/app/src/ui/property_panel_controller.cpp
@@ -6,6 +6,7 @@
 #include "logic_editor_widget.h"
 #include "logic_instruction_dialog.h"
 #include "status_text_dialog.h"
+#include "button_extension_dialog.h"
 #include "services/hmi_editor_service.h"
 #include "services/logic_editor_service.h"
 #include "services/project_service.h"
@@ -131,6 +132,8 @@ void PropertyPanelController::configure()
             &parent_, [this] { chooseTextColor(); });
     QObject::connect(ui_.configureStatusTextButton, &QPushButton::clicked,
             &parent_, [this] { configureStatusText(); });
+    QObject::connect(ui_.configureButtonExtensionButton, &QPushButton::clicked,
+            &parent_, [this] { configureButtonExtension(); });
     ui_.targetPageLabel->setVisible(false);
     ui_.targetPageComboBox->setVisible(false);
     showControlProperties({});
@@ -206,6 +209,7 @@ void PropertyPanelController::showControlProperties(const std::string &control_i
                             static_cast<QWidget *>(ui_.bindingIndexSpinBox),
                             static_cast<QWidget *>(ui_.targetPageComboBox),
                             static_cast<QWidget *>(ui_.buttonOperationComboBox),
+                            static_cast<QWidget *>(ui_.configureButtonExtensionButton),
                             static_cast<QWidget *>(ui_.dataTypeComboBox),
                             static_cast<QWidget *>(ui_.configureStatusTextButton),
                             static_cast<QWidget *>(ui_.textColorEdit),
@@ -230,6 +234,8 @@ void PropertyPanelController::showControlProperties(const std::string &control_i
         ui_.targetPageComboBox->setVisible(false);
         ui_.buttonOperationLabel->setVisible(false);
         ui_.buttonOperationComboBox->setVisible(false);
+        ui_.buttonEnableConditionLabel->setVisible(false);
+        ui_.configureButtonExtensionButton->setVisible(false);
         ui_.dataTypeLabel->setVisible(false);
         ui_.dataTypeComboBox->setVisible(false);
         ui_.statusTextConfigLabel->setVisible(false);
@@ -276,6 +282,49 @@ void PropertyPanelController::showControlProperties(const std::string &control_i
     ui_.buttonOperationComboBox->setCurrentIndex(
         ui_.buttonOperationComboBox->findData(
             static_cast<int>(control->buttonOperation)));
+    ui_.buttonEnableConditionLabel->setVisible(is_button);
+    ui_.configureButtonExtensionButton->setVisible(is_button);
+    ui_.configureButtonExtensionButton->setEnabled(is_button);
+    if (is_button)
+    {
+        if (!control->buttonEnableCondition.has_value())
+        {
+            ui_.configureButtonExtensionButton->setText(QObject::tr("未设置"));
+        }
+        else if (std::holds_alternative<HmiButtonBitEnableCondition>(
+                     *control->buttonEnableCondition))
+        {
+            const auto &condition = std::get<HmiButtonBitEnableCondition>(
+                *control->buttonEnableCondition);
+            ui_.configureButtonExtensionButton->setText(
+                QObject::tr("M%1 = %2")
+                    .arg(condition.address.index())
+                    .arg(condition.expected ? QObject::tr("ON") : QObject::tr("OFF")));
+        }
+        else
+        {
+            const auto &condition = std::get<HmiButtonWordEnableCondition>(
+                *control->buttonEnableCondition);
+            const QString operation = [&condition]
+            {
+                switch (condition.operation)
+                {
+                case HmiButtonConditionOperator::Equal: return QObject::tr("=");
+                case HmiButtonConditionOperator::NotEqual: return QObject::tr("!=");
+                case HmiButtonConditionOperator::LessThan: return QObject::tr("<");
+                case HmiButtonConditionOperator::LessThanOrEqual: return QObject::tr("<=");
+                case HmiButtonConditionOperator::GreaterThan: return QObject::tr(">");
+                case HmiButtonConditionOperator::GreaterThanOrEqual: return QObject::tr(">=");
+                default: return QObject::tr("?");
+                }
+            }();
+            ui_.configureButtonExtensionButton->setText(
+                QObject::tr("D%1 %2 %3")
+                    .arg(condition.address.index())
+                    .arg(operation)
+                    .arg(QString::number(condition.value, 'g', 8)));
+        }
+    }
 
     const bool is_numeric = control->type == HmiControlType::NumericDisplay
         || control->type == HmiControlType::NumericInput;
@@ -700,6 +749,35 @@ void PropertyPanelController::configureStatusText()
     status_reporter_(QObject::tr("状态文本配置已更新"), 3000);
 }
 
+void PropertyPanelController::configureButtonExtension()
+{
+    const HmiControl *old_control = hmi_editor_service_.findControl(
+        current_page_id_(), selected_control_id_);
+    if (old_control == nullptr || old_control->type != HmiControlType::Button)
+    {
+        return;
+    }
+    ButtonExtensionDialog dialog(*old_control, &parent_);
+    if (dialog.exec() != QDialog::Accepted)
+    {
+        return;
+    }
+    const HmiEditorResult result = hmi_editor_service_.updateControl(
+        current_page_id_(), selected_control_id_, dialog.control());
+    if (!result.succeeded)
+    {
+        reportFailure(QObject::tr("按钮扩展配置"), result.message);
+        return;
+    }
+    const std::string updated_control_id = result.id;
+    hmi_editor_widget_->reloadPage();
+    selected_control_id_ = updated_control_id;
+    hmi_editor_widget_->selectControl(updated_control_id);
+    showControlProperties(updated_control_id);
+    refresh_project_ui_();
+    status_reporter_(QObject::tr("按钮扩展配置已更新"), 3000);
+}
+
 void PropertyPanelController::applySelectedLogicNodeProperties()
 {
     const LogicNode *node = logic_editor_service_.findNode(
diff --git a/app/src/ui/property_panel_controller.h b/app/src/ui/property_panel_controller.h
index c25c686..5e0e9ba 100644
--- a/app/src/ui/property_panel_controller.h
+++ b/app/src/ui/property_panel_controller.h
@@ -91,6 +91,8 @@ private:
     void chooseTextColor();
     /** 打开状态文本专用配置并原子更新控件 */
     void configureStatusText();
+    /** 打开按钮启用条件专用配置并原子更新控件 */
+    void configureButtonExtension();
     /** 统一报告属性操作失败 */
     void reportFailure(
         const QString &action, const std::string &message) const;
diff --git a/app/tests/domain_tests.cpp b/app/tests/domain_tests.cpp
index 2e202c3..78d0c4f 100644
--- a/app/tests/domain_tests.cpp
+++ b/app/tests/domain_tests.cpp
@@ -502,6 +502,61 @@ void testHmiAppearancePropertyBoundaries()
     require(project.validate(defaultProjectLimitSettings()), "unknown HMI extension properties must remain supported");
 }
 
+void testButtonEnableConditionBoundaries()
+{
+    Project project = makeValidProject();
+    HmiControl &button = project.hmiPages.front().controls.front();
+    button.buttonEnableCondition = HmiButtonBitEnableCondition{
+        RegisterAddress{RegisterArea::M, 5}, false};
+    require(project.validate(defaultProjectLimitSettings()),
+            "valid M button enable conditions must pass validation");
+
+    button.buttonEnableCondition = HmiButtonWordEnableCondition{
+        RegisterAddress{RegisterArea::D, 20},
+        RegisterDataType::Float64,
+        HmiButtonConditionOperator::LessThan,
+        12.5};
+    require(project.validate(defaultProjectLimitSettings()),
+            "valid D button enable conditions must pass validation");
+
+    button.buttonEnableCondition = HmiButtonBitEnableCondition{
+        RegisterAddress{RegisterArea::D, 5}, true};
+    require(!project.validate(defaultProjectLimitSettings()),
+            "M button conditions must reject D addresses");
+
+    project = makeValidProject();
+    HmiControl &d_button = project.hmiPages.front().controls.front();
+    d_button.buttonEnableCondition = HmiButtonWordEnableCondition{
+        RegisterAddress{RegisterArea::D, 20},
+        RegisterDataType::Int16,
+        HmiButtonConditionOperator::Equal,
+        1.5};
+    require(!project.validate(defaultProjectLimitSettings()),
+            "Int16 button conditions must reject fractional comparison values");
+
+    d_button.buttonEnableCondition = HmiButtonWordEnableCondition{
+        RegisterAddress{RegisterArea::D, 3997},
+        RegisterDataType::Float64,
+        HmiButtonConditionOperator::Equal,
+        1.0};
+    require(!project.validate(defaultProjectLimitSettings()),
+            "Float64 button conditions must reject overflowing start addresses");
+
+    d_button.buttonEnableCondition = HmiButtonWordEnableCondition{
+        RegisterAddress{RegisterArea::D, 20},
+        RegisterDataType::Int16,
+        static_cast<HmiButtonConditionOperator>(99),
+        1.0};
+    require(!project.validate(defaultProjectLimitSettings()),
+            "button conditions must reject unknown comparison operators");
+
+    HmiControl label = d_button;
+    label.type = HmiControlType::Label;
+    label.binding.reset();
+    require(!label.validate(),
+            "non-button controls must reject button enable conditions");
+}
+
 Project makeValidProject()
 {
     // 构造包含 HMI 绑定和完整梯形图网络的最小合法工程作为测试基线
@@ -547,7 +602,7 @@ Project makeValidProject()
     logic.rungs.push_back(rung);
 
     Project project;
-    project.metadata = {"sample-project", "Sample project", "3.0"};
+    project.metadata = {"sample-project", "Sample project", "4.0"};
     project.hmiPages.push_back(page);
     project.initialHmiPageId = page.id;
     project.controlLogics.push_back(logic);
@@ -1076,6 +1131,7 @@ int main()
         testStatusTextDomainRules();
         testMultiWordHmiBoundaries();
         testHmiAppearancePropertyBoundaries();
+        testButtonEnableConditionBoundaries();
         testLogicNodeConfigurationBoundaries();
         testEdgeAndCommentBoundaries();
         testDataInstructionBoundaries();
diff --git a/app/tests/hmi_editor_service_tests.cpp b/app/tests/hmi_editor_service_tests.cpp
index c3baada..f1a7a92 100644
--- a/app/tests/hmi_editor_service_tests.cpp
+++ b/app/tests/hmi_editor_service_tests.cpp
@@ -235,6 +235,45 @@ void testRuntimeUsesRegisterRepository()
     require(repository.readBit(*button.binding).value,
             "toggle button press must invert the current value");
 
+    button.buttonOperation = HmiButtonOperation::MomentaryOn;
+    button.buttonEnableCondition = HmiButtonBitEnableCondition{
+        RegisterAddress{RegisterArea::M, 13}, true};
+    repository.writeBit({RegisterArea::M, 13}, false);
+    HmiButtonEnabledResult condition = runtime_service.evaluateButtonEnabled(button);
+    require(condition.succeeded && !condition.enabled
+                && condition.error == HmiRuntimeError::ConditionNotMet,
+            "an M button condition must disable the button when it is false");
+    require(runtime_service.operateButton(button, HmiButtonEvent::Pressed).error
+                == HmiRuntimeError::ConditionNotMet,
+            "a false M button condition must reject the write at the service boundary");
+    repository.writeBit({RegisterArea::M, 13}, true);
+    condition = runtime_service.evaluateButtonEnabled(button);
+    require(condition.succeeded && condition.enabled,
+            "an M button condition must enable the button when it is true");
+    require(runtime_service.operateButton(button, HmiButtonEvent::Pressed).succeeded
+                && repository.readBit(*button.binding).value,
+            "a satisfied M button condition must allow the configured operation");
+    repository.writeBit({RegisterArea::M, 13}, false);
+    require(runtime_service.operateButton(button, HmiButtonEvent::Released).succeeded
+                && !repository.readBit(*button.binding).value,
+            "a momentary button release must reset safely after its condition changes");
+    repository.writeBit({RegisterArea::M, 12}, true);
+
+    HmiControl d_button = button;
+    d_button.buttonEnableCondition = HmiButtonWordEnableCondition{
+        RegisterAddress{RegisterArea::D, 100},
+        RegisterDataType::Int16,
+        HmiButtonConditionOperator::GreaterThanOrEqual,
+        50.0};
+    repository.writeWord({RegisterArea::D, 100}, 50);
+    condition = runtime_service.evaluateButtonEnabled(d_button);
+    require(condition.succeeded && condition.enabled,
+            "a satisfied D button condition must enable the button");
+    repository.writeWord({RegisterArea::D, 100}, 49);
+    condition = runtime_service.evaluateButtonEnabled(d_button);
+    require(condition.succeeded && !condition.enabled,
+            "a D button condition must compare the current repository value");
+
     HmiControl indicator;
     indicator.id = "running";
     indicator.type = HmiControlType::Indicator;
diff --git a/app/tests/project_management_tests.cpp b/app/tests/project_management_tests.cpp
index b3b2991..0f41d77 100644
--- a/app/tests/project_management_tests.cpp
+++ b/app/tests/project_management_tests.cpp
@@ -75,7 +75,7 @@ LadderRung makeRung(
 Project makeExampleProject()
 {
     Project project;
-    project.metadata = {"example-project", "Example project", "3.0"};
+    project.metadata = {"example-project", "Example project", "4.0"};
 
     HmiPage page;
     page.id = "main-page";
@@ -87,6 +87,11 @@ Project makeExampleProject()
     button.text = "Start";
     button.binding = RegisterAddress{RegisterArea::M, 0};
     button.buttonOperation = HmiButtonOperation::SetOn;
+    button.buttonEnableCondition = HmiButtonWordEnableCondition{
+        RegisterAddress{RegisterArea::D, 100},
+        RegisterDataType::Int16,
+        HmiButtonConditionOperator::GreaterThanOrEqual,
+        10.0};
     page.controls.push_back(button);
     project.hmiPages.push_back(page);
     project.initialHmiPageId = page.id;
@@ -168,7 +173,7 @@ void testEmptyProjectRoundTrip()
     ProjectService service(storage, defaultProjectLimitSettings());
     require(service.createNewProject("Empty project").succeeded,
             "empty project creation must succeed");
-    require(service.project().metadata.formatVersion == "3.0",
+    require(service.project().metadata.formatVersion == "4.0",
             "new projects must use the strict grid format");
 
     const QString path = directory.filePath("empty.json");
@@ -193,15 +198,15 @@ void testGridProjectRoundTrip()
             "the grid project must save");
 
     const QByteArray json = readBytes(path);
-    require(json.contains("\"formatVersion\": \"3.0\"")
+    require(json.contains("\"formatVersion\": \"4.0\"")
                 && json.contains("\"cells\"")
                 && json.contains("\"verticalConnections\"")
                 && json.contains("\"kind\": \"node\"")
                 && json.contains("\"kind\": \"wire\""),
-            "3.0 JSON must persist cells and independent vertical edges");
+            "4.0 JSON must persist cells and independent vertical edges");
     require(!json.contains("\"condition\"")
                 && !json.contains("\"children\""),
-            "3.0 JSON must not serialize the removed expression tree");
+            "4.0 JSON must not serialize the removed expression tree");
 
     const ProjectLoadResult loaded = storage.load(path.toStdString());
     require(loaded.succeeded, "the grid project must load");
@@ -278,12 +283,12 @@ void testMultiWordHmiDataTypeRoundTrip()
     project.hmiPages.front().controls.push_back(double_input);
 
     require(storage.save(project, path.toStdString()).succeeded,
-            "Int32 and Double HMI controls must save in a 3.0 project");
+            "Int32 and Double HMI controls must save in a 4.0 project");
     const QByteArray json = readBytes(path);
     require(json.contains("\"dataType\": \"int32\"")
                 && json.contains("\"dataType\": \"float64\"")
-                && json.contains("\"formatVersion\": \"3.0\""),
-            "multi-word HMI types must use stable JSON names in 3.0");
+                && json.contains("\"formatVersion\": \"4.0\""),
+            "multi-word HMI types must use stable JSON names in 4.0");
 
     const ProjectLoadResult loaded = storage.load(path.toStdString());
     require(loaded.succeeded
@@ -314,6 +319,40 @@ void testMultiWordHmiDataTypeRoundTrip()
             "unknown HMI data types must be rejected by strict JSON loading");
 }
 
+void testButtonEnableConditionRoundTrip()
+{
+    QTemporaryDir directory;
+    require(directory.isValid(), "temporary directory must be valid");
+    JsonProjectStorage storage(defaultProjectLimitSettings());
+    const QString path = directory.filePath("button-condition.json");
+    Project project = makeExampleProject();
+    HmiControl &button = project.hmiPages.front().controls.front();
+    button.buttonEnableCondition = HmiButtonWordEnableCondition{
+        RegisterAddress{RegisterArea::D, 120},
+        RegisterDataType::Float32,
+        HmiButtonConditionOperator::LessThanOrEqual,
+        12.5};
+    require(storage.save(project, path.toStdString()).succeeded,
+            "button enable condition project must save");
+    const QByteArray json = readBytes(path);
+    require(json.contains("\"buttonEnableCondition\"")
+                && json.contains("\"type\": \"dValue\"")
+                && json.contains("\"operation\": \"lessThanOrEqual\"")
+                && json.contains("\"dataType\": \"float32\""),
+            "button enable conditions must use explicit 4.0 JSON fields");
+    const ProjectLoadResult loaded = storage.load(path.toStdString());
+    require(loaded.succeeded,
+            "button enable condition project must load after a JSON round trip");
+    const HmiControl &loaded_button = loaded.project.hmiPages.front().controls.front();
+    require(loaded_button.buttonEnableCondition.has_value()
+                && std::get<HmiButtonWordEnableCondition>(
+                       *loaded_button.buttonEnableCondition).address
+                       == RegisterAddress{RegisterArea::D, 120}
+                && std::get<HmiButtonWordEnableCondition>(
+                       *loaded_button.buttonEnableCondition).value == 12.5,
+            "button enable condition type, address and value must survive round trip");
+}
+
 void testStatusTextRoundTrip()
 {
     QTemporaryDir directory;
@@ -343,7 +382,7 @@ void testStatusTextRoundTrip()
     project.hmiPages.front().controls.push_back(word_status);
 
     require(storage.save(project, path.toStdString()).succeeded,
-            "M and D status text controls must save in 3.0");
+            "M and D status text controls must save in 4.0");
     const QByteArray json = readBytes(path);
     require(json.contains("\"type\": \"statusText\"")
                 && json.contains("\"source\": \"m\"")
@@ -351,7 +390,7 @@ void testStatusTextRoundTrip()
                 && json.contains("\"lower\": null")
                 && json.contains("\"upper\": null")
                 && json.contains("\"dataType\": \"float64\""),
-            "3.0 JSON must store explicit status text modes and range bounds");
+            "4.0 JSON must store explicit status text modes and range bounds");
 
     const ProjectLoadResult loaded = storage.load(path.toStdString());
     require(loaded.succeeded
@@ -383,6 +422,13 @@ void testStrictVersionAndRequiredFields()
                 == ProjectStorageError::UnsupportedVersion,
             "old 2.0 files must be rejected without migration code");
 
+    root.insert(QStringLiteral("formatVersion"), QStringLiteral("3.0"));
+    const QString old_grid_path = directory.filePath("old-grid.json");
+    writeBytes(old_grid_path, QJsonDocument(root).toJson());
+    require(storage.load(old_grid_path.toStdString()).error
+                == ProjectStorageError::UnsupportedVersion,
+            "old 3.0 files must be rejected without migration code");
+
     root = QJsonDocument::fromJson(readBytes(fixture_path)).object();
     QJsonArray logics = root.value(QStringLiteral("controlLogics")).toArray();
     QJsonObject logic = logics.at(0).toObject();
@@ -393,7 +439,7 @@ void testStrictVersionAndRequiredFields()
     writeBytes(missing_path, QJsonDocument(root).toJson());
     require(storage.load(missing_path.toStdString()).error
                 == ProjectStorageError::MissingField,
-            "3.0 must require the vertical connection array explicitly");
+            "4.0 must require the vertical connection array explicitly");
 }
 
 void testInvalidGridAndConnectionsAreRejected()
@@ -463,7 +509,7 @@ void testInvalidGridAndConnectionsAreRejected()
     writeBytes(hidden_comment_path, QJsonDocument(hidden_comment).toJson());
     require(storage.load(hidden_comment_path.toStdString()).error
                 == ProjectStorageError::InvalidProject,
-            "a 3.0 project must reject comments stored on connected branch rows");
+            "a 4.0 project must reject comments stored on connected branch rows");
 
     QJsonObject non_adjacent = original;
     logic = firstLogic(&non_adjacent);
@@ -554,6 +600,7 @@ int main()
         testMOffAlarmRoundTrip();
         testMultiWordHmiDataTypeRoundTrip();
         testStatusTextRoundTrip();
+        testButtonEnableConditionRoundTrip();
         testStrictVersionAndRequiredFields();
         testInvalidGridAndConnectionsAreRejected();
         testProjectServiceStateAndConfiguredLimits();
diff --git a/app/tests/runtime_mode_service_tests.cpp b/app/tests/runtime_mode_service_tests.cpp
index d11fff7..fa5d2bb 100644
--- a/app/tests/runtime_mode_service_tests.cpp
+++ b/app/tests/runtime_mode_service_tests.cpp
@@ -181,6 +181,17 @@ void testModeTransitions()
         {std::nullopt, 0.0, "Low"},
         {0.0, std::nullopt, "High"}}};
     page.controls.push_back(double_status);
+    HmiControl gated_button;
+    gated_button.id = "runtime-gated-button";
+    gated_button.type = HmiControlType::Button;
+    gated_button.bounds = {400, 0, 120, 40};
+    gated_button.binding = RegisterAddress{RegisterArea::M, 30};
+    gated_button.buttonEnableCondition = HmiButtonWordEnableCondition{
+        RegisterAddress{RegisterArea::D, 80},
+        RegisterDataType::Int32,
+        HmiButtonConditionOperator::GreaterThanOrEqual,
+        1.0};
+    page.controls.push_back(gated_button);
     project.initialHmiPageId = page.id;
     project.hmiPages.push_back(page);
     project.alarmDefinitions.push_back(
@@ -296,6 +307,7 @@ void testModeTransitions()
                     {RegisterArea::M, 12}, {RegisterArea::M, 20},
                     {RegisterArea::M, 21}, {RegisterArea::M, 22},
                     {RegisterArea::M, 27}, {RegisterArea::M, 28},
+                    {RegisterArea::M, 30},
                     {RegisterArea::D, 34}, {RegisterArea::D, 35},
                     {RegisterArea::D, 38}, {RegisterArea::D, 39},
                     {RegisterArea::D, 40}, {RegisterArea::D, 41},
@@ -303,12 +315,14 @@ void testModeTransitions()
                     {RegisterArea::D, 60}, {RegisterArea::D, 61},
                     {RegisterArea::D, 62}, {RegisterArea::D, 63},
                     {RegisterArea::D, 70}, {RegisterArea::D, 71},
-                    {RegisterArea::D, 72}, {RegisterArea::D, 73}})
+                    {RegisterArea::D, 72}, {RegisterArea::D, 73},
+                    {RegisterArea::D, 80}, {RegisterArea::D, 81}})
                 && gateway.pollRanges()
                     == std::vector<RegisterWordRange>({
                         {{RegisterArea::D, 50}, 2},
                         {{RegisterArea::D, 60}, 4},
-                        {{RegisterArea::D, 70}, 4}}),
+                        {{RegisterArea::D, 70}, 4},
+                        {{RegisterArea::D, 80}, 2}}),
             "instructions and multi-word status text must be fully polled while comments stay metadata-only");
     gateway.completeInitialRead();
     require(service.initialPlcReadCompleted(),