diff --git a/zh-cn/application-dev/key-features/multi-device-app-dev/responsive-layout.md b/zh-cn/application-dev/key-features/multi-device-app-dev/responsive-layout.md
index ce5f47f69eeb3459efd9feb3ca58a73b9046bccb..816555e7a5eab6740cc5e6d211fcba245e2bd285 100644
--- a/zh-cn/application-dev/key-features/multi-device-app-dev/responsive-layout.md
+++ b/zh-cn/application-dev/key-features/multi-device-app-dev/responsive-layout.md
@@ -230,9 +230,15 @@ export class BreakpointSystem {
   }
 
   public unregister() :void{
-    this.smListener.off("change", this.isBreakpointSM)
-    this.mdListener.off("change", this.isBreakpointMD)
-    this.lgListener.off("change", this.isBreakpointLG)
+    if(this.smListener){
+      this.smListener.off("change", this.isBreakpointSM)
+    }
+    if(this.mdListener){
+      this.mdListener.off("change", this.isBreakpointMD)
+    }
+    if(this.lgListener){
+      this.lgListener.off("change", this.isBreakpointLG)
+    }
   }
 }
 
diff --git a/zh-cn/application-dev/key-features/multi-device-app-dev/settings-application-page.md b/zh-cn/application-dev/key-features/multi-device-app-dev/settings-application-page.md
index 1e8364e1a503aaf874e52f2fbc43cb004575f4a5..6740b70ada0af92fac463010118df0be831cb976 100644
--- a/zh-cn/application-dev/key-features/multi-device-app-dev/settings-application-page.md
+++ b/zh-cn/application-dev/key-features/multi-device-app-dev/settings-application-page.md
@@ -60,6 +60,12 @@ struct Index {
 ```
 ```typescript
 //核心代码 SettingList.ets
+import { MainItem } from '../components/MainItem'
+import { ItemGroup } from '../components/ItemGroup'
+import { SearchBox } from '../components/SearchBox'
+import { MoreConnectionsItem } from '../moreconnections/MoreConnectionsItem'
+import { WlanSettingItem } from '../wlan/WlanSettingItem'
+        
 class  ItemObj {
   title?: Resource
   tag?: string
@@ -114,13 +120,7 @@ let aboutTab:ItemObj={
   title: $r('app.string.aboutTab'),
   icon: $r('app.media.aboutDevice'),
 }
-
-import { MainItem } from '../components/MainItem'
-import { ItemGroup } from '../components/ItemGroup'
-import { SearchBox } from '../components/SearchBox'
-import { MoreConnectionsItem } from '../moreconnections/MoreConnectionsItem'
-import { WlanSettingItem } from '../wlan/WlanSettingItem'
-
+        
 @Component
 export struct SettingList {
   @Builder