diff --git a/entry/src/main/ets/pages/Index.ets b/entry/src/main/ets/pages/Index.ets
index a799b6a..fdde674 100644
--- a/entry/src/main/ets/pages/Index.ets
+++ b/entry/src/main/ets/pages/Index.ets
@@ -17,8 +17,6 @@ import router from '@system.router';
 @Entry
 @Component
 struct Index {
-
-
   aboutToAppear(): void {
 
   }
@@ -26,73 +24,78 @@ struct Index {
   build() {
 
     Column() {
-      Button("单个图片使用").onClick(()=>{
+      Button("单个图片使用").onClick(() => {
         router.push({
           uri: 'pages/SingleImage',
 
         });
       })
-      Button("多图 + LazyForEach").margin({top:10}).onClick(()=>{
+      Button("下采样").margin({ top: 10 }).onClick(() => {
+        router.push({
+          uri: "pages/DownSamplePage",
+        });
+      })
+      Button("多图 + LazyForEach").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/ManyPhotoShowPage',
 
         });
       })
-      Button("多图 + reuse + LazyForeach").margin({top:10}).onClick(()=>{
+      Button("多图 + reuse + LazyForeach").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/UserPage',
 
         });
       })
-      Button("长图显示").margin({top:10}).onClick(()=>{
+      Button("长图显示").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/LongImagePage',
 
         });
       })
-      Button("缩放图片").margin({top:10}).onClick(()=>{
+      Button("缩放图片").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/TransformPage',
 
         });
       })
-      Button("消息+List").margin({top:10}).onClick(()=>{
+      Button("消息+List").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/TestImageFlash',
 
         });
       })
-      Button("自定义缓存key").margin({top:10}).onClick(()=>{
+      Button("自定义缓存key").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/SignatureTestPage',
 
         });
       })
-      Button("预加载图片到文件缓存").margin({top:10}).onClick(()=>{
+      Button("预加载图片到文件缓存").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/TestPrefetchToFileCache',
 
         });
       })
-      Button("从缓存获取图片显示").margin({top:10}).onClick(()=>{
+      Button("从缓存获取图片显示").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/TestIsUrlExist',
 
         });
       })
-      Button("测试单个请求头").margin({top:10}).onClick(()=>{
+      Button("测试单个请求头").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/TestHeader',
 
         });
       })
-      Button("测试写入缓存策略").margin({top:10}).onClick(()=>{
+      Button("测试写入缓存策略").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/TestWriteCacheStage',
 
         });
       })
-      Button("图片变换").margin({top:10}).onClick(()=>{
+      Button("图片变换").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/ImageTransformation',
 
@@ -100,7 +103,7 @@ struct Index {
 
       })
 
-      Button("不同的ObjectFit").margin({top:10}).onClick(()=>{
+      Button("不同的ObjectFit").margin({ top: 10 }).onClick(() => {
         router.push({
           uri: 'pages/ObjectFitPage',
 
diff --git a/entry/src/main/resources/base/profile/main_pages.json b/entry/src/main/resources/base/profile/main_pages.json
index 4d74d0d..77461fa 100644
--- a/entry/src/main/resources/base/profile/main_pages.json
+++ b/entry/src/main/resources/base/profile/main_pages.json
@@ -14,8 +14,9 @@
     "pages/TestHeader",
     "pages/ImageTransformation",
     "pages/ObjectFitPage",
-    "pages/TestWriteCacheStage",
     "pages/LoadStatePage",
-    "pages/TestRemoveCache"
+    "pages/TestRemoveCache",
+    "pages/TestWriteCacheStage",
+    "pages/DownSamplePage"
   ]
 }
\ No newline at end of file
diff --git a/hvigor/hvigor-config.json5 b/hvigor/hvigor-config.json5
index 8c56bf6..14977ad 100644
--- a/hvigor/hvigor-config.json5
+++ b/hvigor/hvigor-config.json5
@@ -1,6 +1,7 @@
 {
   "modelVersion": "5.0.0",
   "dependencies": {
+    "@ohos/hvigor-ohos-plugin": "4.1.2"
   },
   "execution": {
     // "analyze": "default",                    /* Define the build analyze mode. Value: [ "default" | "verbose" | false ]. Default: "default" */
diff --git a/library/BuildProfile.ets b/library/BuildProfile.ets
index 56a40f4..f787c60 100644
--- a/library/BuildProfile.ets
+++ b/library/BuildProfile.ets
@@ -1,5 +1,6 @@
 export default class BuildProfile { 
-	static readonly HAR_VERSION = '3.0.0-rc.0';
+	static readonly HAR_VERSION = '3.0.0-rc.4';
 	static readonly BUILD_MODE_NAME = 'debug';
 	static readonly DEBUG = true;
+	static readonly TARGET_NAME = 'default';
 }
\ No newline at end of file
diff --git a/library/index.ets b/library/index.ets
index d0f552e..716467b 100644
--- a/library/index.ets
+++ b/library/index.ets
@@ -22,4 +22,6 @@ export { BrightnessTransformation } from './src/main/ets/transform/BrightnessTra
 
 export { BlurTransformation } from './src/main/ets/transform/BlurTransformation'
 
+export { DownsampleStrategy } from './src/main/ets/downsampling/DownsampleStartegy'
+
 
diff --git a/library/src/main/ets/ImageKnifeDispatcher.ets b/library/src/main/ets/ImageKnifeDispatcher.ets
index 34d5810..0c714aa 100644
--- a/library/src/main/ets/ImageKnifeDispatcher.ets
+++ b/library/src/main/ets/ImageKnifeDispatcher.ets
@@ -39,6 +39,9 @@ import {
   RequestJobRequest
 } from './model/ImageKnifeData'
 import { combineArrayBuffers } from './model/utils';
+import { BusinessError } from '@kit.BasicServicesKit';
+import { Downsampler } from './downsampling/Downsampler'
+import { DownsampleStrategy } from './downsampling/DownsampleStartegy';
 
 export class ImageKnifeDispatcher {
   // 最大并发
@@ -144,7 +147,12 @@ export class ImageKnifeDispatcher {
         .isFileCacheInit() ? currentRequest.imageKnifeOption.writeCacheStrategy : CacheStrategy.Memory, // 未初始化文件缓存时，不写文件缓存
       engineKey: this.engineKey,
       signature: currentRequest.imageKnifeOption.signature,
-      requestSource
+      requestSource,
+      targetWidth: currentRequest.componentWidth,
+      targetHeight: currentRequest.componentHeight,
+      downsampType: currentRequest.imageKnifeOption.downsampling,
+      autoResize:currentRequest.imageKnifeOption.autoResize
+
     }
     // 启动线程下载和解码主图
     let task = new taskpool.Task(requestJob, request)
@@ -404,7 +412,6 @@ async function requestJob(request: RequestJobRequest): Promise<RequestJobResult
     }
   }
 
-
   if (resBuf == undefined) {
     return {
       pixelMap: undefined,
@@ -418,7 +425,6 @@ async function requestJob(request: RequestJobRequest): Promise<RequestJobResult
   let typeValue = fileTypeUtil.getFileType(resBuf);
   if (typeValue === 'gif' || typeValue === 'webp') {
     let base64Help = new util.Base64Helper()
-
     let base64str = "data:image/" + typeValue + ";base64," + base64Help.encodeToStringSync(new Uint8Array(resBuf))
     return {
       pixelMap: base64str,
@@ -426,10 +432,19 @@ async function requestJob(request: RequestJobRequest): Promise<RequestJobResult
       fileKey: fileKey
     };
   }
-
+  let autoResizes = request.autoResize
   let imageSource: image.ImageSource = image.createImageSource(resBuf);
-  let decodingOptions: image.DecodingOptions = {
+  let imageInfo = await  imageSource.getImageInfo()
+  let a = new Downsampler().calculateScaling(typeValue, imageInfo.size.width, imageInfo.size.height, request.targetWidth,
+    request.targetHeight, request.downsampType,autoResizes)
+  let decodingOptions: image.DecodingOptions = request.downsampType === DownsampleStrategy.NONE ? {
     editable: true,
+  } : {
+    editable: true,
+    desiredSize: {
+      width: a.targetWidth,
+      height: a.targetHeight
+    }
   }
 
   let resPixelmap: PixelMap | undefined = undefined
diff --git a/library/src/main/ets/ImageKnifeOption.ets b/library/src/main/ets/ImageKnifeOption.ets
index 1531896..793813e 100644
--- a/library/src/main/ets/ImageKnifeOption.ets
+++ b/library/src/main/ets/ImageKnifeOption.ets
@@ -13,14 +13,16 @@
  * limitations under the License.
  */
 import taskpool from '@ohos.taskpool';
-import common from '@ohos.app.ability.common'
+import common from '@ohos.app.ability.common';
 import { CacheStrategy } from './model/ImageKnifeData';
 import { PixelMapTransformation } from './transform/PixelMapTransformation';
+import { DownsampleStrategy } from './downsampling/DownsampleStartegy';
 
 export interface HeaderOptions {
   key: string;
   value: Object;
 }
+
 @Observed
 export class ImageKnifeOption {
   // 主图资源
@@ -29,31 +31,22 @@ export class ImageKnifeOption {
   placeholderSrc?: string | PixelMap | Resource;
   // 失败占位图
   errorholderSrc?: string | PixelMap | Resource;
-
   headerOption?: Array<HeaderOptions>;
-
   // 自定义缓存关键字
   signature?: string;
-
   // 主图填充效果
   objectFit?: ImageFit
-
   // 占位图填充效果
   placeholderObjectFit?: ImageFit
-
   // 错误图填充效果
   errorholderObjectFit?: ImageFit
-
   customGetImage?: (context: Context, src: string | PixelMap | Resource) => Promise<ArrayBuffer | undefined>
-
   border?: BorderOptions
   // 缓存策略
   writeCacheStrategy?: CacheStrategy
   // 仅使用缓存加载数据
   onlyRetrieveFromCache?: boolean = false;
-
-  priority? : taskpool.Priority = taskpool.Priority.LOW
-
+  priority?: taskpool.Priority = taskpool.Priority.LOW
   context?: common.UIAbilityContext;
 
   progressListener?: (progress: number)=>void;
@@ -61,6 +54,11 @@ export class ImageKnifeOption {
   transformation?: PixelMapTransformation
   onLoadListener?: OnLoadCallBack | undefined;
 
+  progressListener?: (progress: number) => void;
+  transformation?: PixelMapTransformation;
+  // 下采样
+  downsampling?: DownsampleStrategy = DownsampleStrategy.NONE
+  autoResize?:boolean
   constructor() {
 
   }
diff --git a/library/src/main/ets/ImageKnifeRequest.ets b/library/src/main/ets/ImageKnifeRequest.ets
index 071c71b..c5fabc3 100644
--- a/library/src/main/ets/ImageKnifeRequest.ets
+++ b/library/src/main/ets/ImageKnifeRequest.ets
@@ -15,7 +15,7 @@
 import { ImageKnifeOption } from './ImageKnifeOption';
 import common from '@ohos.app.ability.common';
 import { ImageKnifeRequestSource } from './model/ImageKnifeData';
-
+import { DownsampleStrategy } from './downsampling/DownsampleStartegy';
 
 export class ImageKnifeRequest {
   requestState: ImageKnifeRequestState = ImageKnifeRequestState.PROGRESS
@@ -25,20 +25,29 @@ export class ImageKnifeRequest {
   context: common.UIAbilityContext
   ImageKnifeRequestCallback: ImageKnifeRequestCallback
   componentVersion: number = 0
-  headers: Map<string,Object> = new Map<string,Object>()
+  headers: Map<string, Object> = new Map<string, Object>()
+  downsampType?: DownsampleStrategy
+  autoResizes?:boolean
+
   constructor(option: ImageKnifeOption,
               uIAbilityContext: common.UIAbilityContext,
               width: number,
               height: number,
               version: number,
-              ImageKnifeRequestCallback: ImageKnifeRequestCallback) {
+              ImageKnifeRequestCallback: ImageKnifeRequestCallback,
+              downsampType?: DownsampleStrategy,
+              autoResizes?:boolean
+  ) {
     this.imageKnifeOption = option
     this.context = uIAbilityContext
     this.componentWidth = width
     this.componentHeight = height
     this.componentVersion = version
     this.ImageKnifeRequestCallback = ImageKnifeRequestCallback
+    this.downsampType = downsampType
+    this.autoResizes = autoResizes
   }
+
   // RequestOption调用header对于的方法
   addHeader(key: string, value: Object) {
     this.headers.set(key, value);
@@ -63,5 +72,5 @@ export enum ImageKnifeRequestState {
 
 
 export interface ImageKnifeRequestCallback {
-  showPixelMap: (version: number, pixelMap: PixelMap | string , requestSource: ImageKnifeRequestSource) => void;
+  showPixelMap: (version: number, pixelMap: PixelMap | string, requestSource: ImageKnifeRequestSource) => void;
 }
diff --git a/library/src/main/ets/components/ImageKnifeComponent.ets b/library/src/main/ets/components/ImageKnifeComponent.ets
index 2d8c3bd..302a08f 100644
--- a/library/src/main/ets/components/ImageKnifeComponent.ets
+++ b/library/src/main/ets/components/ImageKnifeComponent.ets
@@ -18,6 +18,7 @@ import common from '@ohos.app.ability.common';
 import { ImageKnife } from '../ImageKnife';
 import { LogUtil } from '../utils/LogUtil';
 import { ImageKnifeRequestSource } from '../model/ImageKnifeData';
+import { Downsampler } from '../downsampling/Downsampler';
 
 @Component
 export struct ImageKnifeComponent {
@@ -33,6 +34,8 @@ export struct ImageKnifeComponent {
   private currentHeight: number = 0
   private componentVersion: number = 0
   private currentContext: common.UIAbilityContext | undefined = undefined
+  private targetHeight: number =0
+  private targetWidth: number =0
 
   aboutToAppear(): void {
     //闪动问题失效，注释相应代码后续修复
@@ -82,7 +85,10 @@ export struct ImageKnifeComponent {
             ImageKnife.getInstance().execute(this.getRequest(this.currentWidth, this.currentHeight))
           }
         }
-      })
+      }).sourceSize({
+          width:250,
+          height:250
+    })
   }
 
   watchImageKnifeOption() {
@@ -116,8 +122,9 @@ export struct ImageKnifeComponent {
             }
             this.pixelMap = pixelMap
             if (typeof this.pixelMap !== 'string') {
+              let info =await this.pixelMap.getImageInfo()
+              //图片自适应处理
               if (this.imageKnifeOption.objectFit === ImageFit.Auto) {
-                let info = await this.pixelMap.getImageInfo()
 
                 this.adaptiveWidth = this.currentWidth
                 this.adaptiveHeight = info.size.height * this.currentWidth / info.size.width
diff --git a/library/src/main/ets/model/ImageKnifeData.ets b/library/src/main/ets/model/ImageKnifeData.ets
index f2abd25..ad15aa4 100644
--- a/library/src/main/ets/model/ImageKnifeData.ets
+++ b/library/src/main/ets/model/ImageKnifeData.ets
@@ -17,6 +17,7 @@ import { ImageKnifeRequest } from '../ImageKnifeRequest'
 import { IEngineKey } from '../key/IEngineKey'
 import { PixelMapTransformation } from '../transform/PixelMapTransformation'
 import common from '@ohos.app.ability.common';
+import { DownsampleStrategy} from '../downsampling/DownsampleStartegy'
 
 export interface ImageKnifeData {
   source: PixelMap | string,
@@ -60,7 +61,10 @@ export interface RequestJobResult {
   fileKey: string
   loadFail?: string,
 }
-
+export interface targetCcaleType {
+  width: number,
+  height: number
+}
 /**
  * request子线程处理时的请求参数
  */
@@ -76,5 +80,9 @@ export interface RequestJobRequest {
   writeCacheStrategy?: CacheStrategy
   signature?: string
   engineKey: IEngineKey
+  targetWidth:number
+  targetHeight: number
+  downsampType?:DownsampleStrategy
+  autoResize?:boolean
 }