diff --git a/zh-cn/application-dev/media/image-pixelmap-operation.md b/zh-cn/application-dev/media/image-pixelmap-operation.md
index f327d2c6192000ce8237ecb79d460049706433a4..a28daf42e51a3f40ed47d11ef69c8e14ba9c13c0 100644
--- a/zh-cn/application-dev/media/image-pixelmap-operation.md
+++ b/zh-cn/application-dev/media/image-pixelmap-operation.md
@@ -36,11 +36,11 @@
    })
    
    // 场景二：读取指定区域内的图片数据，结果写入area.pixels中
-   const area = {
+   const area : image.PositionArea = {
      pixels: new ArrayBuffer(8),
      offset: 0,
      stride: 8,
-     region: { size : { height: 1, width: 2 }, x: 0, y: 0 }
+     region: { size: { height: 1, width: 2 }, x: 0, y: 0 }
    }
    pixelMap.readPixels(area).then(() => {
      console.info('Succeeded in reading the image data in the area.');