diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_f0.c b/bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_f0.c
index dd472b9694008497af63543ae77c4a92b96c5083..0a73e968e20ab93ef67c683a9d7de8010ca5f5b2 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_f0.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_f0.c
@@ -84,12 +84,6 @@ int stm32_flash_write(rt_uint32_t addr, const rt_uint8_t *buf, size_t size)
         return -RT_EINVAL;
     }
 
-    if (size % 4 != 0)
-    {
-        LOG_E("write size must be 4-byte alignment");
-        return -RT_EINVAL;
-    }
-
     if ((end_addr) > STM32_FLASH_END_ADDRESS)
     {
         LOG_E("write outrange flash size! addr is (0x%p)", (void *)(addr + size));
diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_f1.c b/bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_f1.c
index 306b2fb665c9d7968ea6a1b83b3ae6ae20b98d94..37022dd1ca38ce418440f1250214bcf198df6697 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_f1.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_f1.c
@@ -84,12 +84,6 @@ int stm32_flash_write(rt_uint32_t addr, const rt_uint8_t *buf, size_t size)
         return -RT_EINVAL;
     }
 
-    if (size % 4 != 0)
-    {
-        LOG_E("write size must be 4-byte alignment");
-        return -RT_EINVAL;
-    }
-
     if ((end_addr) > STM32_FLASH_END_ADDRESS)
     {
         LOG_E("write outrange flash size! addr is (0x%p)", (void *)(addr + size));