diff --git a/app/src/ui/main_window.cpp b/app/src/ui/main_window.cpp
index 2b7c3d4..4a668b7 100644
--- a/app/src/ui/main_window.cpp
+++ b/app/src/ui/main_window.cpp
@@ -26,6 +26,7 @@
 #include <QActionGroup>
 #include <QAbstractSpinBox>
 #include <QApplication>
+#include <QCloseEvent>
 #include <QEvent>
 #include <QFileDialog>
 #include <QGraphicsScene>
@@ -315,6 +316,16 @@ bool MainWindow::eventFilter(QObject *watched, QEvent *event)
     return QMainWindow::eventFilter(watched, event);
 }
 
+void MainWindow::closeEvent(QCloseEvent *event)
+{
+    if (!confirmSaveBeforeDestructiveAction())
+    {
+        event->ignore();
+        return;
+    }
+    QMainWindow::closeEvent(event);
+}
+
 const std::string &MainWindow::currentHmiPageId() const
 {
     return current_hmi_page_id_;
@@ -1035,6 +1046,44 @@ void MainWindow::refreshProjectUi()
 {
     project_workspace_controller_->refresh();
     updateEditActions();
+    updateWindowTitle();
+}
+
+void MainWindow::updateWindowTitle()
+{
+    QString title = tr("综合平台编程器");
+    if (project_service_.isModified())
+    {
+        title += QStringLiteral("*");
+    }
+    setWindowTitle(title);
+}
+
+bool MainWindow::confirmSaveBeforeDestructiveAction()
+{
+    if (!project_service_.isModified())
+    {
+        return true;
+    }
+
+    const QString project_name = fromUtf8(project_service_.project().metadata.name);
+    const QMessageBox::StandardButton choice = QMessageBox::warning(
+        this,
+        tr("工程尚未保存"),
+        tr("工程“%1”有未保存的修改，是否先保存？").arg(project_name),
+        QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel,
+        QMessageBox::Save);
+    if (choice == QMessageBox::Cancel)
+    {
+        return false;
+    }
+    if (choice == QMessageBox::Discard)
+    {
+        return true;
+    }
+
+    saveProject();
+    return !project_service_.isModified();
 }
 
 void MainWindow::updateProjectTreeActions()
@@ -1245,6 +1294,10 @@ void MainWindow::deleteSelectedLogicObject()
 
 void MainWindow::createNewProject()
 {
+    if (!confirmSaveBeforeDestructiveAction())
+    {
+        return;
+    }
     const QString name = QInputDialog::getText(
         this, tr("新建工程"), tr("工程名称"));
     if (name.isEmpty())
@@ -1273,12 +1326,18 @@ void MainWindow::createNewProject()
 
 void MainWindow::saveProject()
 {
+    if (!project_service_.hasCurrentFile())
+    {
+        saveProjectAs();
+        return;
+    }
     const ProjectOperationResult result = project_service_.save();
     if (!result.succeeded)
     {
-        saveProjectAs();
+        showProjectResult(tr("保存工程"), fromUtf8(result.message), false);
         return;
     }
+    updateWindowTitle();
     showProjectResult(tr("保存工程"), tr("工程已保存"), true);
 }
 
@@ -1291,6 +1350,10 @@ void MainWindow::saveProjectAs()
         return;
     }
     const ProjectOperationResult result = project_service_.saveAs(toUtf8(path));
+    if (result.succeeded)
+    {
+        updateWindowTitle();
+    }
     showProjectResult(
         tr("保存工程"),
         result.succeeded ? tr("工程已保存") : fromUtf8(result.message),
@@ -1299,6 +1362,10 @@ void MainWindow::saveProjectAs()
 
 void MainWindow::loadProject()
 {
+    if (!confirmSaveBeforeDestructiveAction())
+    {
+        return;
+    }
     const QString path = QFileDialog::getOpenFileName(
         this, tr("加载工程"), {}, tr("工程文件 (*.json)"));
     if (path.isEmpty())
diff --git a/app/src/ui/main_window.h b/app/src/ui/main_window.h
index b677526..0a457e9 100644
--- a/app/src/ui/main_window.h
+++ b/app/src/ui/main_window.h
@@ -20,6 +20,7 @@
 QT_BEGIN_NAMESPACE
 class QAction;
 class QActionGroup;
+class QCloseEvent;
 class QEvent;
 class QLabel;
 
@@ -94,6 +95,7 @@ public:
 
 protected:
     bool eventFilter(QObject *watched, QEvent *event) override;
+    void closeEvent(QCloseEvent *event) override;
 
 private:
     // 配置菜单和工具栏动作
@@ -117,6 +119,8 @@ private:
     void clearActiveSelection();
     void updateEditActions();
     void clearEditorHistories();
+    void updateWindowTitle();
+    bool confirmSaveBeforeDestructiveAction();
     // 刷新工程树和当前 HMI 页面信息
     void refreshProjectUi();
     void updateProjectTreeActions();
diff --git a/app/tests/main_window_tests.cpp b/app/tests/main_window_tests.cpp
index ffd9ac3..23c3014 100644
--- a/app/tests/main_window_tests.cpp
+++ b/app/tests/main_window_tests.cpp
@@ -560,6 +560,51 @@ void testRuntimeAlarmListInteraction()
             "AlarmList must become visible again after returning to editing");
 }
 
+void testWindowTitleTracksUnsavedProjectChanges()
+{
+    TestProjectStorage storage;
+    ProjectService project_service(storage);
+    HmiEditorService editor_service(project_service);
+    LogicEditorService logic_editor_service(project_service);
+    require(editor_service.ensureDefaultPage().succeeded,
+            "window-title test must create a default HMI page");
+    require(logic_editor_service.ensureDefaultLogic().succeeded,
+            "window-title test must create a default control logic");
+    require(project_service.saveAs("window-title-test.json").succeeded,
+            "window-title fixture must start from a saved project");
+
+    VirtualRegisterRepository repository;
+    HmiRuntimeService runtime_service(repository);
+    AlarmEditorService alarm_editor_service(project_service);
+    AlarmService alarm_service(project_service, repository);
+    RegisterCommentService register_comment_service(project_service);
+    OfflineSimulationService simulation_service(repository);
+    RuntimeModeService mode_service(project_service, simulation_service);
+    RegisterMonitorService monitor_service(repository);
+    MainWindow window(
+        mode_service,
+        project_service,
+        editor_service,
+        logic_editor_service,
+        runtime_service,
+        alarm_editor_service,
+        alarm_service,
+        register_comment_service,
+        monitor_service);
+
+    require(!window.windowTitle().endsWith(QLatin1Char('*')),
+            "a saved project title must not show an unsaved marker");
+    requiredChild<QAction>(window, "addLabelAction")->trigger();
+    require(project_service.isModified()
+                && window.windowTitle().endsWith(QLatin1Char('*')),
+            "editing the project must immediately add an unsaved marker");
+
+    requiredChild<QAction>(window, "saveProjectAction")->trigger();
+    require(!project_service.isModified()
+                && !window.windowTitle().endsWith(QLatin1Char('*')),
+            "saving the project must immediately remove the unsaved marker");
+}
+
 void testModeActionsControlEditingAvailability()
 {
     // 验证模式动作会同步禁用编辑入口，并在失败时恢复当前选择
@@ -1482,6 +1527,7 @@ int main(int argc, char *argv[])
         testRuntimeProgressBarRendering();
         testRuntimePageJumpDoesNotRequireRegisterWritePermission();
         testRuntimeAlarmListInteraction();
+        testWindowTitleTracksUnsavedProjectChanges();
         testModeActionsControlEditingAvailability();
         testEdgeTimerPropertyEditingAndParallelMenu();
         testPlcConfigurationUsesDialog();