diff --git a/kernel/include/los_config.h b/kernel/include/los_config.h
index f87e5983..35123c90 100644
--- a/kernel/include/los_config.h
+++ b/kernel/include/los_config.h
@@ -118,8 +118,9 @@ extern "C" {
  * @ingroup los_config
  * Configuration item for using system defined vector base address and interrupt handlers.
  * If LOSCFG_USE_SYSTEM_DEFINED_INTERRUPT is set to 0, vector base address will not be
- * modified by system. In arm, it should be noted that PendSV_Handler and SysTick_Handler will
- * be redefined in this case because system depends these interrupt handlers to run normally.
+ * modified by system. In arm, it should be noted that PendSV_Handler and SysTick_Handler should
+ * be redefined to HalPendSV and OsTickHandler respectly in this case, because system depends on
+ * these interrupt handlers to run normally. What's more, LOS_HwiCreate will not register handlers.
  */
 #ifndef LOSCFG_USE_SYSTEM_DEFINED_INTERRUPT
 #define LOSCFG_USE_SYSTEM_DEFINED_INTERRUPT                 1
diff --git a/targets/cortex-m4_stm32f429ig_fire-challenger_iar/board/iar_stm32f429ig_fire-challenger.c b/targets/cortex-m4_stm32f429ig_fire-challenger_iar/board/iar_stm32f429ig_fire-challenger.c
index 2ba89930..2927fe5d 100644
--- a/targets/cortex-m4_stm32f429ig_fire-challenger_iar/board/iar_stm32f429ig_fire-challenger.c
+++ b/targets/cortex-m4_stm32f429ig_fire-challenger_iar/board/iar_stm32f429ig_fire-challenger.c
@@ -1,3 +1,5 @@
+#include "los_arch_interrupt.h"
+#include "los_tick.h"
 #include "stm324x9i_eval.h"
 
 /**