diff --git a/src/popup/README.md b/src/popup/README.md
index 63b727f00..e1ed0086b 100644
--- a/src/popup/README.md
+++ b/src/popup/README.md
@@ -119,7 +119,7 @@ export default {
 | v-model:show | Whether to show popup | _boolean_ | `false` |
 | overlay | Whether to show overlay | _boolean_ | `true` |
 | position | Can be set to `top` `bottom` `right` `left` | _string_ | `center` |
-| overlay-class | Custom overlay class | _string_ | - |
+| overlay-class | Custom overlay class | _string \| string[] \| object_ | - |
 | overlay-style | Custom overlay style | _object_ | - |
 | duration | Transition duration, unit second | _number \| string_ | `0.3` |
 | round | Whether to show round corner | _boolean_ | `false` |
diff --git a/src/popup/README.zh-CN.md b/src/popup/README.zh-CN.md
index 1fdb43ee7..cd22bba80 100644
--- a/src/popup/README.zh-CN.md
+++ b/src/popup/README.zh-CN.md
@@ -129,7 +129,7 @@ export default {
 | v-model:show | 是否显示弹出层 | _boolean_ | `false` |
 | overlay | 是否显示遮罩层 | _boolean_ | `true` |
 | position | 弹出位置，可选值为 `top` `bottom` `right` `left` | _string_ | `center` |
-| overlay-class | 自定义遮罩层类名 | _string_ | - |
+| overlay-class | 自定义遮罩层类名 | _string \| string[] \| object_ | - |
 | overlay-style | 自定义遮罩层样式 | _object_ | - |
 | duration | 动画时长，单位秒 | _number \| string_ | `0.3` |
 | round | 是否显示圆角 | _boolean_ | `false` |
diff --git a/src/popup/index.js b/src/popup/index.js
index ba96b795c..502690441 100644
--- a/src/popup/index.js
+++ b/src/popup/index.js
@@ -45,7 +45,7 @@ export const popupSharedProps = {
   // overlay custom style
   overlayStyle: Object,
   // overlay custom class name
-  overlayClass: String,
+  overlayClass: null,
   // Initial rendering animation
   transitionAppear: Boolean,
   // whether to show overlay