diff --git a/entry/src/main/ets/pages/DownsamplingPage.ets b/entry/src/main/ets/pages/DownsamplingPage.ets
index 05f2976..4df6654 100644
--- a/entry/src/main/ets/pages/DownsamplingPage.ets
+++ b/entry/src/main/ets/pages/DownsamplingPage.ets
@@ -165,6 +165,7 @@ struct Index {
                     loadSrc: pngUrl,
                     placeholderSrc: $r('app.media.icon_loading'),
                     errorholderSrc: $r('app.media.icon_failed'),
+                    downsampling: new fitter()
                   }
                 });
               Button('svg')
@@ -174,6 +175,7 @@ struct Index {
                     loadSrc: svgUrl,
                     placeholderSrc: $r('app.media.icon_loading'),
                     errorholderSrc: $r('app.media.icon_failed'),
+                    downsampling: new fitter()
                   }
 
                 });
@@ -184,6 +186,7 @@ struct Index {
                     loadSrc: bmpUrl,
                     placeholderSrc: $r('app.media.icon_loading'),
                     errorholderSrc: $r('app.media.icon_failed'),
+                    downsampling: new fitter()
                   }
                 });
               Button('jpg')
@@ -193,6 +196,7 @@ struct Index {
                     loadSrc: jpgUrl,
                     placeholderSrc: $r('app.media.icon_loading'),
                     errorholderSrc: $r('app.media.icon_failed'),
+                    downsampling: new fitter()
                   }
                 });
               Button('gif')
@@ -202,6 +206,7 @@ struct Index {
                     loadSrc: gifUrl,
                     placeholderSrc: $r('app.media.icon_loading'),
                     errorholderSrc: $r('app.media.icon_failed'),
+                    downsampling: new fitter()
                   }
                 });
               Button('webp')
@@ -211,6 +216,7 @@ struct Index {
                     loadSrc: webpUrl,
                     placeholderSrc: $r('app.media.icon_loading'),
                     errorholderSrc: $r('app.media.icon_failed'),
+                    downsampling: new fitter()
                   }
                 });
             }.margin({ top: 20, bottom: 20 })
diff --git a/library/src/main/ets/components/imageknife/Downsampling/DownsampleStartegy.ets b/library/src/main/ets/components/imageknife/Downsampling/DownsampleStartegy.ets
index 3c9614a..78f0362 100644
--- a/library/src/main/ets/components/imageknife/Downsampling/DownsampleStartegy.ets
+++ b/library/src/main/ets/components/imageknife/Downsampling/DownsampleStartegy.ets
@@ -122,7 +122,7 @@ export class CenterOutside implements BaseDownsampling {
 }
 
 @Sendable
-export class FitCenter {
+export class FitCenter implements BaseDownsampling {
   getName() {
     return "FitCenter"
   }