diff --git a/src/picker/PickerColumn.js b/src/picker/PickerColumn.js
index b2de06b74..df436e9ed 100644
--- a/src/picker/PickerColumn.js
+++ b/src/picker/PickerColumn.js
@@ -33,10 +33,10 @@ export default createComponent({
     valueKey: String,
     allowHtml: Boolean,
     className: String,
-    itemHeight: Number,
+    itemHeight: [Number, String],
     defaultIndex: Number,
-    swipeDuration: Number,
-    visibleItemCount: Number,
+    swipeDuration: [Number, String],
+    visibleItemCount: [Number, String],
     initialOptions: {
       type: Array,
       default: () => [],
@@ -228,7 +228,7 @@ export default createComponent({
 
       const index = this.getIndexByOffset(distance);
 
-      this.duration = this.swipeDuration;
+      this.duration = +this.swipeDuration;
       this.setIndex(index, true);
     },
 
diff --git a/src/picker/README.md b/src/picker/README.md
index 1a7a89b2c..20d56cd13 100644
--- a/src/picker/README.md
+++ b/src/picker/README.md
@@ -259,18 +259,18 @@ export default {
 | Attribute | Description | Type | Default |
 |------|------|------|------|
 | columns | Columns data | *Column[]* | `[]` |
-| show-toolbar | Whether to show toolbar | *boolean* | `false` |
-| toolbar-position | Toolbar position, cat be set to `bottom` | *string* | `top` |
-| title | Toolbar title | *string* | `''` |
-| loading | Whether to show loading prompt | *boolean* | `false` |
-| value-key | Key of option text | *string* | `text` |
-| item-height | Option height | *number* | `44` |
+| title | Toolbar title | *string* | - |
 | confirm-button-text | Text of confirm button | *string* | `Confirm` |
 | cancel-button-text | Text of cancel button | *string* | `Cancel` |
-| visible-item-count | Count of visible columns | *number* | `5` |
+| value-key | Key of option text | *string* | `text` |
+| toolbar-position | Toolbar position, cat be set to `bottom` | *string* | `top` |
+| loading | Whether to show loading prompt | *boolean* | `false` |
+| show-toolbar | Whether to show toolbar | *boolean* | `false` |
 | allow-html `v2.1.8` | Whether to allow HTML in option text | *boolean* | `true` |
 | default-index | Default value index of single column picker | *number* | `0` |
-| swipe-duration `v2.2.10` | Duration of the momentum animation，unit `ms` | *number*  | `1000` |
+| item-height | Option height | *number \| string* | `44` |
+| visible-item-count | Count of visible columns | *number \| string* | `5` |
+| swipe-duration `v2.2.10` | Duration of the momentum animation，unit `ms` | *number \| string*  | `1000` |
 
 ### Events
 
diff --git a/src/picker/README.zh-CN.md b/src/picker/README.zh-CN.md
index 02d391863..4c7bb4d08 100644
--- a/src/picker/README.zh-CN.md
+++ b/src/picker/README.zh-CN.md
@@ -273,22 +273,22 @@ export default {
 | 参数 | 说明 | 类型 | 默认值 |
 |------|------|------|------|
 | columns | 对象数组，配置每一列显示的数据 | *Column[]* | `[]` |
-| show-toolbar | 是否显示顶部栏 | *boolean* | `false` |
-| toolbar-position | 顶部栏位置，可选值为`bottom` | *string* | `top` |
-| title | 顶部栏标题 | *string* | `''` |
-| loading | 是否显示加载状态 | *boolean* | `false` |
-| value-key | 选项对象中，文字对应的 key | *string* | `text` |
-| item-height | 选项高度 | *number* | `44` |
+| title | 顶部栏标题 | *string* | - |
 | confirm-button-text | 确认按钮文字 | *string* | `确认` |
 | cancel-button-text | 取消按钮文字 | *string* | `取消` |
-| visible-item-count | 可见的选项个数 | *number* | `5` |
+| value-key | 选项对象中，选项文字对应的键名 | *string* | `text` |
+| toolbar-position | 顶部栏位置，可选值为`bottom` | *string* | `top` |
+| loading | 是否显示加载状态 | *boolean* | `false` |
+| show-toolbar | 是否显示顶部栏 | *boolean* | `false` |
 | allow-html `v2.1.8` | 是否允许选项内容中渲染 HTML | *boolean* | `true` |
-| default-index | 单列选择器的默认选中项索引，<br>多列选择器请参考下方的 Columns 配置 | *number* | `0` |
-| swipe-duration `v2.2.10` | 快速滑动时惯性滚动的时长，单位`ms` | *number*  | `1000` |
+| default-index | 单列选择时，默认选中项的索引 | *number* | `0` |
+| item-height | 选项高度 | *number \| string* | `44` |
+| visible-item-count | 可见的选项个数 | *number \| string* | `5` |
+| swipe-duration `v2.2.10` | 快速滑动时惯性滚动的时长，单位`ms` | *number \| string*  | `1000` |
 
 ### Events
 
-Picker 组件的事件会根据 columns 是单列或多列返回不同的参数
+当选择器有多列时，事件回调参数会返回数组
 
 | 事件名 | 说明 | 回调参数 |
 |------|------|------|
diff --git a/src/picker/index.js b/src/picker/index.js
index 21fda3c65..f0217a74f 100644
--- a/src/picker/index.js
+++ b/src/picker/index.js
@@ -283,7 +283,7 @@ export default createComponent({
   },
 
   render(h) {
-    const { itemHeight } = this;
+    const itemHeight = +this.itemHeight;
     const wrapHeight = itemHeight * this.visibleItemCount;
 
     const frameStyle = {
diff --git a/src/picker/shared.ts b/src/picker/shared.ts
index 085eee17a..7e8e619e5 100644
--- a/src/picker/shared.ts
+++ b/src/picker/shared.ts
@@ -3,7 +3,7 @@ export type SharedPickerProps = {
   loading?: boolean;
   itemHeight: number;
   showToolbar?: boolean;
-  visibleItemCount: number;
+  visibleItemCount: number | string;
   cancelButtonText?: string;
   confirmButtonText?: string;
 };
@@ -19,15 +19,15 @@ export const pickerProps = {
     default: true,
   },
   visibleItemCount: {
-    type: Number,
+    type: [Number, String],
     default: 5,
   },
   itemHeight: {
-    type: Number,
+    type: [Number, String],
     default: 44,
   },
   swipeDuration: {
-    type: Number,
+    type: [Number, String],
     default: 1000,
   },
 };