diff --git a/types/uni-app/lib/uni.d.ts b/types/uni-app/lib/uni.d.ts
index 4c1403c674..49123dc195 100644
--- a/types/uni-app/lib/uni.d.ts
+++ b/types/uni-app/lib/uni.d.ts
@@ -81,7 +81,7 @@ declare class Uni {
      *
      * 参考: [http://uniapp.dcloud.io/frame?id=upx2px](http://uniapp.dcloud.io/frame?id=upx2px)
      */
-    upx2px(upx: number): number;
+    upx2px(upx?: number): number;
     /**
      * 创建一个 WebSocket 连接
      *
@@ -5285,11 +5285,11 @@ interface CanvasToTempFilePathOptions {
     /**
      * 输出图片宽度（默认为 width * 屏幕像素密度）
      */
-    destWidth?: boolean;
+    destWidth?: number;
     /**
      * 输出图片高度（默认为 height * 屏幕像素密度）
      */
-    destHeight?: () => void;
+    destHeight?: number;
     /**
      * 画布标识，传入 <canvas/> 的 canvas-id
      */
diff --git a/types/uni-app/uni-app-tests.ts b/types/uni-app/uni-app-tests.ts
index 455fe77a5b..9718681d5c 100644
--- a/types/uni-app/uni-app-tests.ts
+++ b/types/uni-app/uni-app-tests.ts
@@ -28,3 +28,20 @@ uni.createSelectorQuery().select('.test').context(res => {
         }
     });
 });
+
+const px: number = uni.upx2px(750);
+
+uni.canvasToTempFilePath({
+    x: 0,
+    y: 0,
+    width: 100,
+    height: 100,
+    destWidth: 100,
+    destHeight: 100,
+    canvasId: 'test',
+    fileType: 'png',
+    quality: 1,
+    success() {
+        console.log('canvasToTempFilePath success');
+    }
+});