diff --git a/zh-cn/application-dev/quick-start/har-package.md b/zh-cn/application-dev/quick-start/har-package.md
index 110559b41e9ae4659da13663b7f140d5080ec6e0..0dbf9a34fd1f68a5a54f5a9297c27fe2a29302cb 100644
--- a/zh-cn/application-dev/quick-start/har-package.md
+++ b/zh-cn/application-dev/quick-start/har-package.md
@@ -103,7 +103,7 @@ export { MainPage } from './src/main/ets/components/MainPage/MainPage'
 ```js
 // library/src/main/ts/test.ets
 export class Log {
-    static info(msg) {
+    static info(msg: string) {
         console.info(msg);
     }
 }