diff --git a/entry/src/main/ets/common/CustomEngineKeyImpl.ets b/entry/src/main/ets/common/CustomEngineKeyImpl.ets
index 06f2901..1473024 100644
--- a/entry/src/main/ets/common/CustomEngineKeyImpl.ets
+++ b/entry/src/main/ets/common/CustomEngineKeyImpl.ets
@@ -35,6 +35,9 @@ export class CustomEngineKeyImpl implements IEngineKey {
       if (imageKnifeOption.transformation) {
         key += "transformation=" + this.getTransformation(imageKnifeOption.transformation) + ";"
       }
+        if ((imageKnifeOption.downsampleOf !== DownsampleStrategy.NONE && imageKnifeOption.downsampleOf !== undefined)) {
+        key += "downsampleOf" + imageKnifeOption.downsampleOf +"width="+width+"height="+ height
+      }
     }
     return key
   }