diff --git a/VideoPlayerSample/entry/src/main/ets/pages/IndexPage.ets b/VideoPlayerSample/entry/src/main/ets/pages/IndexPage.ets
index c117cfe05764c03568380ac41bdf25486998386d..d2eded78c1f2ba9ae96d74b38e1ee71c2768f480 100644
--- a/VideoPlayerSample/entry/src/main/ets/pages/IndexPage.ets
+++ b/VideoPlayerSample/entry/src/main/ets/pages/IndexPage.ets
@@ -199,7 +199,7 @@ struct IndexPage {
   }
   // [End device_width]
   @Builder
-  videoDes(item: VideoData) {
+  videoDes(item: VideoData): void {
     VideoDes({
       item: item,
       isFloatWindow: this.isFloatWindow,
@@ -213,7 +213,7 @@ struct IndexPage {
   }
 
   @Builder
-  rightSlide(item: VideoData) {
+  rightSlide(item: VideoData): void {
     RightSide({ item: item })
       .visibility((this.isFullScreen && !this.isFloatWindow && !this.isFullLandscapeScreen) ? Visibility.Visible :
       Visibility.Hidden)
diff --git a/VideoPlayerSample/entry/src/main/ets/utils/WindowUtil.ets b/VideoPlayerSample/entry/src/main/ets/utils/WindowUtil.ets
index 9d7583a6c92f199c48d0a4938ebe794995d02d19..7ebd5f05e9d3d9ab2bc8e968b1c1a05eb812a024 100644
--- a/VideoPlayerSample/entry/src/main/ets/utils/WindowUtil.ets
+++ b/VideoPlayerSample/entry/src/main/ets/utils/WindowUtil.ets
@@ -26,7 +26,7 @@ export class WindowUtil {
   private windowStage?: window.WindowStage;
   private mainWindowClass?: window.Window;
 
-  public static getInstance() {
+  public static getInstance(): WindowUtil {
     if (!WindowUtil.instance) {
       WindowUtil.instance = new WindowUtil();
     }
diff --git a/VideoPlayerSample/entry/src/main/ets/view/AVPlayer.ets b/VideoPlayerSample/entry/src/main/ets/view/AVPlayer.ets
index af9a06374b85b7d3da6de1f3fff2e3a85e7c6804..7032b47a1a3e0d3a0e8e763ef23b24cec9ab84a0 100644
--- a/VideoPlayerSample/entry/src/main/ets/view/AVPlayer.ets
+++ b/VideoPlayerSample/entry/src/main/ets/view/AVPlayer.ets
@@ -52,7 +52,7 @@ export struct VideoPlayer {
   @State volume: number = 0;
   @State visible: boolean = false;
   @State screenBrightness: number = 0;
-  private xComponentController = new XComponentController();
+  private xComponentController: XComponentController = new XComponentController();
   private showTipsTime: string = '';
   private slideWidth: number = 130;
   private blockSize: number = 16;
@@ -396,7 +396,7 @@ export struct VideoPlayer {
   }
 
   @Builder
-  PlayControl() {
+  PlayControl(): void {
     Column() {
       Row() {
         Text(this.currentStringTime)