diff --git a/CHANGELOG.md b/CHANGELOG.md
index fec8946..1cc4c80 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@
 - Modify memory cache limit and file cache limit
 - Fix record decodeEndTime in imageKinfaData
 - Add image buffersize in memory cache
+- Optimize the magic number of heif format image files
+- Default image request does not require duplicate creation
 
 ## 3.2.0-rc.6
 - Support LogUtil to turn off log
diff --git a/library/src/main/ets/components/ImageKnifeComponent.ets b/library/src/main/ets/components/ImageKnifeComponent.ets
index 2cad1ea..fe45efb 100644
--- a/library/src/main/ets/components/ImageKnifeComponent.ets
+++ b/library/src/main/ets/components/ImageKnifeComponent.ets
@@ -140,40 +140,46 @@ export struct ImageKnifeComponent {
   }
 
   getRequest(width: number, height: number,componentId: number): ImageKnifeRequest {
-    this.request = new ImageKnifeRequest(
-      this.imageKnifeOption,
-      this.imageKnifeOption.context !== undefined ? this.imageKnifeOption.context : this.getCurrentContext(),
-      width,
-      height,
-      this.componentVersion,
-      {
-        showPixelMap: (version: number, pixelMap: PixelMap | string,size:Size, requestSource: ImageKnifeRequestSource) => {
-          if (version !== this.componentVersion) {
-            return //针对reuse场景，不显示历史图片
-          }
-          this.pixelMap = pixelMap
-          LogUtil.info('image load showPixelMap:' + this.request?.componentId + ',srcType:' + requestSource +
-            ',version:' + this.request?.componentVersion +
-            ',size:' + JSON.stringify(size))
-          if (this.imageKnifeOption.objectFit === ImageFit.Auto && this.isImageFitAutoResize == false && requestSource == ImageKnifeRequestSource.SRC) {
-            this.adaptiveHeight = undefined
-            this.isImageFitAutoResize = true
-          }
+    if (this.imageKnifeOption.downsampleOf !== undefined) {
+      this.request = undefined
+    }
+    
+    if (this.request == undefined) {
+      this.request = new ImageKnifeRequest(
+        this.imageKnifeOption,
+        this.imageKnifeOption.context !== undefined ? this.imageKnifeOption.context : this.getCurrentContext(),
+        width,
+        height,
+        this.componentVersion,
+        {
+          showPixelMap: (version: number, pixelMap: PixelMap | string,size:Size, requestSource: ImageKnifeRequestSource) => {
+            if (version !== this.componentVersion) {
+              return //针对reuse场景，不显示历史图片
+            }
+            this.pixelMap = pixelMap
+            LogUtil.info('image load showPixelMap:' + this.request?.componentId + ',srcType:' + requestSource +
+              ',version:' + this.request?.componentVersion +
+              ',size:' + JSON.stringify(size))
+            if (this.imageKnifeOption.objectFit === ImageFit.Auto && this.isImageFitAutoResize == false && requestSource == ImageKnifeRequestSource.SRC) {
+              this.adaptiveHeight = undefined
+              this.isImageFitAutoResize = true
+            }
 
-          if (requestSource == ImageKnifeRequestSource.SRC) {
-            this.objectFit =
-              this.imageKnifeOption.objectFit === undefined ? ImageFit.Contain : this.imageKnifeOption.objectFit
-          } else if (requestSource == ImageKnifeRequestSource.PLACE_HOLDER) {
-            this.objectFit =
-              this.imageKnifeOption.placeholderObjectFit === undefined ? (this.imageKnifeOption.objectFit === undefined ? ImageFit.Contain : this.imageKnifeOption.objectFit) : this.imageKnifeOption.placeholderObjectFit
-          } else {
-            this.objectFit =
-            this.imageKnifeOption.errorholderObjectFit === undefined ? (this.imageKnifeOption.objectFit === undefined ? ImageFit.Contain : this.imageKnifeOption.objectFit) : this.imageKnifeOption.errorholderObjectFit
+            if (requestSource == ImageKnifeRequestSource.SRC) {
+              this.objectFit =
+                this.imageKnifeOption.objectFit === undefined ? ImageFit.Contain : this.imageKnifeOption.objectFit
+            } else if (requestSource == ImageKnifeRequestSource.PLACE_HOLDER) {
+              this.objectFit =
+                this.imageKnifeOption.placeholderObjectFit === undefined ? (this.imageKnifeOption.objectFit === undefined ? ImageFit.Contain : this.imageKnifeOption.objectFit) : this.imageKnifeOption.placeholderObjectFit
+            } else {
+              this.objectFit =
+                this.imageKnifeOption.errorholderObjectFit === undefined ? (this.imageKnifeOption.objectFit === undefined ? ImageFit.Contain : this.imageKnifeOption.objectFit) : this.imageKnifeOption.errorholderObjectFit
+            }
           }
-        }
-      },
-      componentId
-    )
+        },
+        componentId
+      )
+    }
     return this.request
   }
 }
diff --git a/library/src/main/ets/utils/FileTypeUtil.ets b/library/src/main/ets/utils/FileTypeUtil.ets
index 4c20316..7f070df 100644
--- a/library/src/main/ets/utils/FileTypeUtil.ets
+++ b/library/src/main/ets/utils/FileTypeUtil.ets
@@ -26,7 +26,7 @@ export class FileTypeUtil {
     'ico': [new Uint8Array([0x00,0x00,0x01,0x00])],
     'tiff': [new Uint8Array([0x49, 0x20, 0x49]), new Uint8Array([0x49, 0x49, 0x2A, 0x00]), new Uint8Array([0x4D, 0x4D, 0x00, 0x2A]), new Uint8Array([0x4D, 0x4D, 0x00, 0x2B])],
     // 添加更多的文件类型和特征
-    'heic': [new Uint8Array([0x00, 0x00, 0x00, 0x18, 0x66, 0x74, 0x79, 0x70, 0x68, 0x65, 0x69, 0x63, 0x00, 0x00, 0x00, 0x00]),new Uint8Array([0x00, 0x00, 0x00, 0x1C, 0x66, 0x74, 0x79, 0x70, 0x68, 0x65, 0x69, 0x63, 0x00, 0x00, 0x00, 0x00])],
+    'heic': [new Uint8Array([0x00, 0x00, 0x00, 0x18, 0x66, 0x74, 0x79, 0x70, 0x68, 0x65, 0x69, 0x63]),new Uint8Array([0x00, 0x00, 0x00, 0x1C, 0x66, 0x74, 0x79, 0x70, 0x6D, 0x69, 0x66, 0x31])],
   };