diff --git a/testsuits/sample/kernel/event/It_los_event.h b/testsuits/sample/kernel/event/It_los_event.h
index f16e89e5..75913049 100644
--- a/testsuits/sample/kernel/event/It_los_event.h
+++ b/testsuits/sample/kernel/event/It_los_event.h
@@ -41,7 +41,6 @@ extern "C" {
 #define SYS_EXIST_SWTMR 1
 #define TEST_HWI_RUNTIME 0x100000
 #define TASK_LOOP_NUM 0x100000
-#define TASK_STACK_SIZE_TEST 0x400
 #if (LOSCFG_BASE_CORE_SWTMR == 1)
 #define TASK_EXISTED_NUM 3
 #else