diff --git a/src/tree-select/README.md b/src/tree-select/README.md
index ce5215114..f636ad4ba 100644
--- a/src/tree-select/README.md
+++ b/src/tree-select/README.md
@@ -113,9 +113,9 @@ export default {
 |------|------|------|------|
 | items | Required datasets for the component | *Item[]* | `[]` |
 | height | Height | *number \| string* | `300` |
-| main-Active-index | The index of selected parent node | *number* | `0` |
-| active-id | Id of selected item | *number \| string \| (number \| string)[]* | `0` |
-| max `v2.2.0` | Maximum number of selected items | *number* | `Infinity` |
+| main-active-index | The index of selected parent node | *number \| string* | `0` |
+| active-id | Id of selected item | *number \| string \|<br>(number \| string)[]* | `0` |
+| max `v2.2.0` | Maximum number of selected items | *number \| string* | `Infinity` |
 
 ### Events
 
diff --git a/src/tree-select/README.zh-CN.md b/src/tree-select/README.zh-CN.md
index 08074f339..5c0f300a5 100644
--- a/src/tree-select/README.zh-CN.md
+++ b/src/tree-select/README.zh-CN.md
@@ -121,9 +121,9 @@ export default {
 |------|------|------|------|
 | items | 分类显示所需的数据 | *Item[]* | `[]` |
 | height | 高度，默认单位为`px` | *number \| string* | `300` |
-| main-active-index | 左侧选中项的索引 | *number* | `0` |
-| active-id | 右侧选中项的 id，支持传入数组 | *number \| string \| (number \| string)[]* | `0` |
-| max `v2.2.0` | 右侧项最大选中个数 | *number* | `Infinity` |
+| main-active-index | 左侧选中项的索引 | *number \| string* | `0` |
+| active-id | 右侧选中项的 id，支持传入数组 | *number \| string \|<br>(number \| string)[]* | `0` |
+| max `v2.2.0` | 右侧项最大选中个数 | *number \| string* | `Infinity` |
 
 ### Events
 
diff --git a/src/tree-select/index.tsx b/src/tree-select/index.tsx
index 9296522e1..3a614fede 100644
--- a/src/tree-select/index.tsx
+++ b/src/tree-select/index.tsx
@@ -29,11 +29,11 @@ export type TreeSelectChildren = {
 export type TreeSelectActiveId = number | string | (number | string)[];
 
 export type TreeSelectProps = {
-  max: number;
+  max: number | string;
   height: number | string;
   items: TreeSelectItem[];
   activeId: TreeSelectActiveId;
-  mainActiveIndex: number;
+  mainActiveIndex: number | string;
 };
 
 export type TreeSelectSlots = DefaultSlots & {
@@ -50,7 +50,7 @@ function TreeSelect(
 ) {
   const { height, items, mainActiveIndex, activeId } = props;
 
-  const selectedItem: Partial<TreeSelectItem> = items[mainActiveIndex] || {};
+  const selectedItem: Partial<TreeSelectItem> = items[+mainActiveIndex] || {};
   const subItems = selectedItem.children || [];
   const isMultiple = Array.isArray(activeId);
 
@@ -136,7 +136,7 @@ function TreeSelect(
 
 TreeSelect.props = {
   max: {
-    type: Number,
+    type: [Number, String],
     default: Infinity,
   },
   items: {
@@ -152,7 +152,7 @@ TreeSelect.props = {
     default: 0,
   },
   mainActiveIndex: {
-    type: Number,
+    type: [Number, String],
     default: 0,
   },
 };