diff --git a/library/src/main/ets/components/imageknife/Downsampling/Downsampler.ets b/library/src/main/ets/components/imageknife/Downsampling/Downsampler.ets
index 202ee00..4624e6a 100644
--- a/library/src/main/ets/components/imageknife/Downsampling/Downsampler.ets
+++ b/library/src/main/ets/components/imageknife/Downsampling/Downsampler.ets
@@ -36,13 +36,13 @@ export class Downsampler {
       orientedSourceHeight = sourceWidth;
     }
     /*安卓的模式*/
-    let exactScaleFactor: number = FitCenter.getScaleFactor(orientedSourceWidth, orientedSourceHeight, targetWidth, targetHeight)
+    let exactScaleFactor: number = new FitCenter().getScaleFactor(orientedSourceWidth, orientedSourceHeight, targetWidth, targetHeight)
     if (exactScaleFactor <= 0) {
       throw new Error("Cannot	round	with exactScaleFactor");
     }
     console.log('exactScaleFactor', exactScaleFactor)
     /*安卓的模式*/
-    let rounding: SampleSizeRounding = CenterOutside.getSampleSizeRounding(orientedSourceWidth, orientedSourceHeight, targetWidth, targetHeight)
+    let rounding: SampleSizeRounding = new FitCenter().getSampleSizeRounding(orientedSourceWidth, orientedSourceHeight, targetWidth, targetHeight)
     if (rounding == null) {
       throw new Error("Cannot round with null rounding");
     }