diff --git a/kvdb_stage_demo/entry/src/main/ets/MainAbility/MainAbility.ts b/kvdb_stage_demo/entry/src/main/ets/MainAbility/MainAbility.ts
index 90b7f1db2be18fd070ae535e160a138093c5c04a..84fb458cf3685567e9589403d9debec2104fd3c5 100644
--- a/kvdb_stage_demo/entry/src/main/ets/MainAbility/MainAbility.ts
+++ b/kvdb_stage_demo/entry/src/main/ets/MainAbility/MainAbility.ts
@@ -31,6 +31,7 @@ export default class MainAbility extends Ability {
     syncListenerStarted = false;
     dataListenerStarted = false;
     localDeviceId;
+    kvstoreStatus = 'close'; // 'open','close'
 
     onCreate(want,launchParam){
         // Ability is creating, initialize resources for this ability
@@ -200,6 +201,7 @@ export default class MainAbility extends Ability {
                     self.logText += "kvStore options : " + JSON.stringify(options) +"\r\n";
                     self.logText += "getKVStore success\r\n";
                     self.kvStore = store;
+                    self.kvstoreStatus = 'open';
                 }).catch((err) => {
                     console.log("[JSDemo]: getKVStore err: " + JSON.stringify(err));
                     this.logText += "getKVStore err" + JSON.stringify(err) +"\r\n";
@@ -327,6 +329,26 @@ export default class MainAbility extends Ability {
             }
         })
 
+        globalThis.CloseKVStore = (()=>{
+            try{
+                console.log('[JSDemo]CloseKVStore enter.');
+                this.logText += "CloseKVStore enter.\r\n";
+                let self = this;
+                this.kvManager.closeKVStore(this.appId, this.storeId, function (err, data) {
+                    if (err != undefined) {
+                        console.error(`Fail to close KVStore.code is ${err.code},message is ${err.message}`);
+                        self.logText += "CloseKVStore, Fail to close KVStore.code is"+err.code+",message is"+err.message+".\r\n";
+                        return;
+                    }
+                    self.kvstoreStatus = 'close';
+                    console.log('[JSDemo]CloseKVStore success');
+                    self.logText += "CloseKVStore success.\r\n";
+                });
+            }catch(e){
+                console.log("[JSDemo] CloseKVStore e " + e);
+                this.logText += "CloseKVStore e " + e + ".\r\n";
+            }
+        })
 
         globalThis.DeleteKvStore = (() =>{
             console.info("[JSDemo] DeleteKvStore begin");
@@ -342,13 +364,15 @@ export default class MainAbility extends Ability {
                 return;
             }
             try {
-                this.kvManager.closeKVStore(this.appId, this.storeId).then(() => {
-                    console.log('closeKVStore success');
-                    this.logText += "closeKVStore success.\r\n";
-                }).catch((err) => {
-                    console.log('closeKVStore err');
-                    this.logText += "closeKVStore err." + JSON.stringify(err) + "\r\n";
-                });
+                if(this.kvstoreStatus == 'open'){
+                    this.kvManager.closeKVStore(this.appId, this.storeId).then(() => {
+                        console.log('closeKVStore success');
+                        this.logText += "closeKVStore success.\r\n";
+                    }).catch((err) => {
+                        console.log('closeKVStore err');
+                        this.logText += "closeKVStore err." + JSON.stringify(err) + "\r\n";
+                    });
+                }
                 this.kvManager.deleteKVStore(this.appId, this.storeId).then(() => {
                     console.log('deleteKVStore success');
                     this.logText += "deleteKVStore success.\r\n";
diff --git a/kvdb_stage_demo/entry/src/main/ets/pages/index/index.ets b/kvdb_stage_demo/entry/src/main/ets/pages/index/index.ets
index 121ed4360de787e71b79e7858616110080fe6ce4..e1c799d843b79b4dc7f36b6b6e0accb68f7ab036 100644
--- a/kvdb_stage_demo/entry/src/main/ets/pages/index/index.ets
+++ b/kvdb_stage_demo/entry/src/main/ets/pages/index/index.ets
@@ -262,9 +262,9 @@ struct Index {
             globalThis.Sync();
             this.text = globalThis.printLogs();
           })
-        Button('DeleteKvStore').fontSize(10).fontWeight(FontWeight.Normal).type(ButtonType.Capsule).margin({}).width('33%').height('100%')
+        Button('CloseKvStore').fontSize(10).fontWeight(FontWeight.Normal).type(ButtonType.Capsule).margin({}).width('33%').height('100%')
           .backgroundColor('#f32dc400').onClick(() => {
-            globalThis.DeleteKvStore();
+            globalThis.CloseKVStore();
             this.text = globalThis.printLogs();
           })
       }
@@ -273,6 +273,11 @@ struct Index {
       .height('6%')
 
       Row({space:2}){
+        Button('DeleteKvStore').fontSize(10).fontWeight(FontWeight.Normal).type(ButtonType.Capsule).margin({}).width('33%').height('100%')
+          .backgroundColor('#f32dc400').onClick(() => {
+          globalThis.DeleteKvStore();
+          this.text = globalThis.printLogs();
+        })
         Button('PrintLogs').fontSize(10).fontWeight(FontWeight.Normal).type(ButtonType.Capsule).margin({}).width('33%').height('100%')
           .backgroundColor('#f32dc400').onClick(() => {
             this.text = globalThis.printLogs();
@@ -295,7 +300,7 @@ struct Index {
           .backgroundColor(0xFFFFFF)
           .borderRadius(15)
           .gesture(
-          SwipeGesture({ direction: SwipeDirection.Vertical })
+          SwipeGesture({ direction: SwipeDirection.Vertical }) // 垂直滑动
             .onAction((event: GestureEvent) => {
               this.scroller.scrollBy(0, 150)
             })
@@ -303,10 +308,10 @@ struct Index {
           .width('100%')
           .height('500%')
         }
-        .scrollable(ScrollDirection.Vertical)
-        .scrollBar(BarState.On)
-        .scrollBarColor(Color.Gray)
-        .scrollBarWidth(3)
+        .scrollable(ScrollDirection.Vertical) // 滚动方向纵向
+        .scrollBar(BarState.On) // 滚动条常驻显示
+        .scrollBarColor(Color.Gray) // 滚动条颜色
+        .scrollBarWidth(3) // 滚动条宽度
         .edgeEffect(EdgeEffect.None)
         .onScroll((xOffset: number, yOffset: number) => {
           console.info(xOffset + ' ' + yOffset)