diff --git a/zh-cn/application-dev/reference/apis/js-apis-screen-lock.md b/zh-cn/application-dev/reference/apis/js-apis-screen-lock.md
index aa38ec63b015feded98150530e67dc714aa6285d..d740c3a3cc4f98c52b62bfa96f09afb48d08cef8 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-screen-lock.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-screen-lock.md
@@ -216,7 +216,7 @@ onSystemEvent(callback: Callback<SystemEvent>): boolean
 
 ```js
 try {
-    let isSuccess = screenLock.onSystemEvent((event) => {
+    let isSuccess = screenlock.onSystemEvent((event) => {
         console.log(`Register the system event which related to screenlock successfully. eventType: ${event.eventType}`)
     });
 } catch (err) {