diff --git a/docs/en-US/component/form.md b/docs/en-US/component/form.md
index 0865d27349..16d2633cd2 100644
--- a/docs/en-US/component/form.md
+++ b/docs/en-US/component/form.md
@@ -184,7 +184,7 @@ form/accessibility
 | rules                   | Validation rules of form, see the [following table](#formitemrule), more advanced usage at [async-validator](https://github.com/yiminghe/async-validator).             | ^[object]`Arrayable<FormItemRule>`                  | —       |
 | error                   | Field error message, set its value and the field will validate error and show this message immediately.                                                                | ^[string]                                           | —       |
 | show-message            | Whether to show the error message.                                                                                                                                     | ^[boolean]                                          | true    |
-| inline-message          | Inline style validate message.                                                                                                                                         | ^[string] / ^[boolean]                              | ''      |
+| inline-message          | Inline style validate message.                                                                                                                                         | ^[boolean]                                          | false   |
 | size                    | Control the size of components in this form-item.                                                                                                                      | ^[enum]`'' \| 'large' \| 'default' \| 'small'`      | —       |
 | for                     | Same as for in native label.                                                                                                                                           | ^[string]                                           | —       |
 | validate-status         | Validation state of formItem.                                                                                                                                          | ^[enum]`'' \| 'error' \| 'validating' \| 'success'` | —       |
diff --git a/packages/components/form/src/form-item.ts b/packages/components/form/src/form-item.ts
index 9dc773f7db..d9b2152f8c 100644
--- a/packages/components/form/src/form-item.ts
+++ b/packages/components/form/src/form-item.ts
@@ -73,8 +73,8 @@ export const formItemProps = buildProps({
    * @description Inline style validate message.
    */
   inlineMessage: {
-    type: [String, Boolean],
-    default: '',
+    type: Boolean,
+    default: undefined,
   },
   /**
    * @description Whether to show the error message.