diff --git a/library/src/main/ets/ImageKnifeLoader.ets b/library/src/main/ets/ImageKnifeLoader.ets
index a05cc11..f6ad0a6 100644
--- a/library/src/main/ets/ImageKnifeLoader.ets
+++ b/library/src/main/ets/ImageKnifeLoader.ets
@@ -39,6 +39,16 @@ class RequestData {
 /**
  * ImageKnifeDispatcher 抽取出来的方法，因@Concurrent只能import方法，故抽取到另一个类
  */
+interface GeneratedObjectLiteralInterface_1 {
+  height: number;
+  width: number;
+}
+
+interface Generated {
+  editable: boolean;
+  desiredSize: Size;
+}
+
 export class ImageKnifeLoader {
   static async parseImage(resBuf: ArrayBuffer, typeValue: string, fileKey: string,
     request: RequestJobRequest): Promise<RequestJobResult> {
@@ -75,19 +85,15 @@ export class ImageKnifeLoader {
     }
 
     let size = (await imageSource.getImageInfo()).size
-    if ((request.downsampType !== undefined && request.downsampType !== DownsampleStrategy.NONE) &&
-      request.requestSource == ImageKnifeRequestSource.SRC) {
-      let reqSize =
-        new Downsampler().calculateScaling(typeValue, size.width, size.height, request.targetWidth,
-          request.targetHeight, request.downsampType)
-      decodingOptions = {
-        editable: request.requestSource === ImageKnifeRequestSource.SRC && request.transformation !== undefined ? true : false,
-        desiredSize: {
-          width: reqSize.targetWidth,
-          height: reqSize.targetHeight
-        }
+    try{
+      if ((request.downsampType !== DownsampleStrategy.NONE) &&
+        request.requestSource == ImageKnifeRequestSource.SRC ) {
+        decodingOptions =await ImageKnifeLoader.downsamplerReqSize(typeValue,request,size,ImageKnifeRequestSource.SRC)
       }
+    }catch(err){
+      return ImageKnifeLoader.makeEmptyResult("image.createImageSource failed")
     }
+
     await imageSource.createPixelMap(decodingOptions)
       .then((pixelmap: PixelMap) => {
         resPixelmap = pixelmap
@@ -125,18 +131,13 @@ export class ImageKnifeLoader {
       editable: true,
       desiredSize: defaultSize
     };
-    if ((request.downsampType !== DownsampleStrategy.NONE && request.downsampType !== undefined) &&
-      request.requestSource == ImageKnifeRequestSource.SRC) {
-      let reqSize =
-        new Downsampler().calculateScaling(typeValue, size.width, size.height, request.targetWidth,
-          request.targetHeight, request.downsampType)
-      opts = {
-        editable: true,
-        desiredSize: {
-          height: vp2px(reqSize.targetHeight),
-          width: vp2px(reqSize.targetWidth)
-        }
+    try{
+      if ((request.downsampType !== DownsampleStrategy.NONE) &&
+        request.requestSource == ImageKnifeRequestSource.SRC ) {
+        opts =await ImageKnifeLoader.downsamplerReqSize(typeValue,request,size)
       }
+    }catch(err){
+      return ImageKnifeLoader.makeEmptyResult("image.createImageSource failed")
     }
     await imageSource.createPixelMap(opts)
       .then((pixelmap: PixelMap) => {
@@ -382,4 +383,25 @@ export class ImageKnifeLoader {
     }
     return resBuf
   }
-}
\ No newline at end of file
+  static async downsamplerReqSize(typeValue:string,request:RequestJobRequest ,size:Size,SRC?:ImageKnifeRequestSource): Promise<image.DecodingOptions>{
+    let reqSize = new Downsampler().calculateScaling(typeValue, size.width, size.height, request.targetWidth, request.targetHeight, request.downsampType)
+    if(typeValue=="svg") {
+      return ({
+        editable: true,
+        desiredSize: ({
+          height: vp2px(reqSize.targetHeight),
+          width: vp2px(reqSize.targetWidth)
+        } as Size)
+      } as  image.DecodingOptions )
+    }else {
+       return( {
+          editable: request.requestSource ===SRC && request.transformation !== undefined ? true : false,
+          desiredSize: ({
+            width: reqSize.targetWidth,
+            height: reqSize.targetHeight
+          }as Size)
+        }as  image.DecodingOptions)
+      }
+  }
+}
+