diff --git a/src/kernel/base/los_bitmap.c b/src/kernel/base/los_bitmap.c
index d299fb6..84a056a 100644
--- a/src/kernel/base/los_bitmap.c
+++ b/src/kernel/base/los_bitmap.c
@@ -35,7 +35,7 @@ extern "C" {
 #endif /* __cplusplus */
 #endif /* __cplusplus */
 
-#define OS_BITMAP_MASK 0x1FU//位图的掩码，与数据进行与操作得到低五位的信息
+#define OS_BITMAP_MASK 0x1FU
 
 VOID LOS_BitmapSet(UINT32 *bitmap, UINT16 pos)
 {