diff --git a/src/image-preview/ImagePreviewItem.js b/src/image-preview/ImagePreviewItem.js
index c8fb7fbd2..9bc00f044 100644
--- a/src/image-preview/ImagePreviewItem.js
+++ b/src/image-preview/ImagePreviewItem.js
@@ -94,11 +94,15 @@ export default {
     });
 
     const setScale = (scale) => {
-      state.scale = range(scale, +props.minZoom, +props.maxZoom);
-      emit('scale', {
-        scale: state.scale,
-        index: props.active,
-      });
+      scale = range(scale, +props.minZoom, +props.maxZoom);
+
+      if (scale !== state.scale) {
+        state.scale = scale;
+        emit('scale', {
+          scale,
+          index: props.active,
+        });
+      }
     };
 
     const resetScale = () => {
diff --git a/src/image-preview/README.md b/src/image-preview/README.md
index a8af3945f..d463479e7 100644
--- a/src/image-preview/README.md
+++ b/src/image-preview/README.md
@@ -127,7 +127,7 @@ export default {
 | showIndex | Whether to show index | _boolean_ | `true` |
 | showIndicators | Whether to show indicators | _boolean_ | `false` |
 | loop | Whether to enable loop | _boolean_ | `true` |
-| swipeDuration | Animation duration (ms) | _number \| string_ | `500` |
+| swipeDuration | Animation duration (ms) | _number \| string_ | `300` |
 | onClose | Emitted when ImagePreview is closed | _Function_ | - |
 | onChange | Emitted when current image changed | _Function_ | - |
 | onScale | Emitted when scaling current image | _Function_ | - |
diff --git a/src/image-preview/README.zh-CN.md b/src/image-preview/README.zh-CN.md
index 56c944490..1f9d5b688 100644
--- a/src/image-preview/README.zh-CN.md
+++ b/src/image-preview/README.zh-CN.md
@@ -186,7 +186,7 @@ export default {
 | --- | --- | --- | --- |
 | images | 需要预览的图片 URL 数组 | _string[]_ | `[]` |
 | start-position | 图片预览起始位置索引 | _number \| string_ | `0` |
-| swipe-duration | 动画时长，单位为 ms | _number \| string_ | `500` |
+| swipe-duration | 动画时长，单位为 ms | _number \| string_ | `300` |
 | show-index | 是否显示页码 | _boolean_ | `true` |
 | show-indicators | 是否显示轮播指示器 | _boolean_ | `false` |
 | loop | 是否开启循环播放 | _boolean_ | `true` |