diff --git a/bsp/stm32f20x/applications/startup.c b/bsp/stm32f20x/applications/startup.c
index 15879299aa..dd9969168d 100644
--- a/bsp/stm32f20x/applications/startup.c
+++ b/bsp/stm32f20x/applications/startup.c
@@ -137,9 +137,6 @@ int main(void)
 	/* disable interrupt first */
 	rt_hw_interrupt_disable();
 
-	/* init system setting */
-	SystemInit();
-
 	/* startup RT-Thread RTOS */
 	rtthread_startup();