diff --git a/kernel/common/los_magickey.c b/kernel/common/los_magickey.c
index f0361149..7e5f00ee 100644
--- a/kernel/common/los_magickey.c
+++ b/kernel/common/los_magickey.c
@@ -143,8 +143,8 @@ INT32 CheckMagicKey(CHAR key)
     }
 
     if (magicKeySwitch != 0) {
-        for (i = 0; g_magicOpTable[i] != NULL; ++i) {
-            if (key == g_magicOpTable[i]->magicKey) {
+        for (i = 0; i < MAGIC_KEY_NUM; i++) {
+            if (g_magicOpTable[i] != NULL && key == g_magicOpTable[i]->magicKey) {
                 (g_magicOpTable[i])->opHandler();
                 return 1;
             }