diff --git a/modbus/modbus_flash.c b/modbus/modbus_flash.c
new file mode 100644
index 0000000..2b6a6ec
--- /dev/null
+++ b/modbus/modbus_flash.c
@@ -0,0 +1,75 @@
+#include "stm32f4xx_flash.h"
+#include "stm32f4xx.h"
+#include "modbus.h"
+#include "modbus_flash.h"
+#include "string.h"
+
+extern uint8_t ModbusCoil[1250];  
+extern uint16_t ModbusReg[10000];
+
+
+uint8_t ModbusCoilWriteFlash(void)
+{
+    uint32_t addres = MODBUS_FLASH_COIL_ADDR;
+    uint16_t halfWord;
+    FLASH_Status status;
+
+    FLASH_Unlock();
+    /*扇区擦除，写入之前必须先擦除*/
+    status = FLASH_EraseSector(MODBUS_FLASH_SECTOR, VoltageRange_3);
+
+    for(uint16_t i = 0; i < 1250; i += 2)
+    {
+        /*前面的放在低字节，后面的放在高字节*/
+        halfWord =  ((uint16_t)ModbusCoil[i + 1] << 8) | ((uint16_t)ModbusCoil[i]);
+
+        status = FLASH_ProgramHalfWord(addres, ModbusCoil[i]);
+
+        /*写入失败，停止写入*/
+        if(status != FLASH_COMPLETE)
+        {
+            break;
+        }
+
+        addres += 2;
+    }
+    FLASH_Lock();
+}
+
+
+uint8_t ModbusRegWriteFlash(void)
+{
+    uint32_t addres = MODBUS_FLASH_REG_ADDR;
+    FLASH_Status status;
+
+    FLASH_Unlock();
+    /*扇区擦除，写入之前必须先擦除*/
+    status = FLASH_EraseSector(MODBUS_FLASH_SECTOR, VoltageRange_3);
+
+    for(uint16_t i = 0; i < 10000; i++)
+    {
+        status = FLASH_ProgramHalfWord(addres, ModbusReg[i]);
+
+        /*写入失败，停止写入*/
+        if(status != FLASH_COMPLETE)
+        {
+            break;
+        }
+
+        addres += 2;
+    }
+
+    FLASH_Lock();
+}
+
+
+uint8_t ModbusRegReadFlash(void)
+{
+    memcpy(ModbusCoil, (const void *)MODBUS_FLASH_COIL_ADDR, 1250);
+}
+
+uint8_t ModbusCoilReadFlash(void)
+{
+    memcpy(ModbusReg, (const void *)MODBUS_FLASH_REG_ADDR, 10000);
+}
+
diff --git a/modbus/modbus_flash.h b/modbus/modbus_flash.h
new file mode 100644
index 0000000..7d66948
--- /dev/null
+++ b/modbus/modbus_flash.h
@@ -0,0 +1,18 @@
+#ifndef __MODBUS_FLASH_H
+#define __MODBUS_FLASH_H
+
+/*写入FLASH中的Sector 11*/
+/*FLASH地址每+1，代表1字节*/
+
+/*Sector 11起始地址*/
+#define MODBUS_FLASH_BASE          0x080E0000UL
+/*Sector 11编号*/
+#define MODBUS_FLASH_SECTOR        FLASH_Sector_11
+/*线圈数据起始地址*/
+#define MODBUS_FLASH_COIL_ADDR      MODBUS_FLASH_BASE
+/*寄存器数据起始地址*/ 
+#define MODBUS_FLASH_REG_ADDR       (MODBUS_FLASH_BASE + 0x4E2UL)   /*0x4E2 = K1250*/
+
+
+
+#endif