diff --git a/api/@ohos.app.form.formHost.d.ts b/api/@ohos.app.form.formHost.d.ts
index 107b40c152b6f3042a31cee812f01cb11c6b2bd3..7e0254e06048c7a56d4b68c437904d51b91879c1 100644
--- a/api/@ohos.app.form.formHost.d.ts
+++ b/api/@ohos.app.form.formHost.d.ts
@@ -1336,5 +1336,25 @@ declare namespace formHost {
    * @since 20
    */
   function updateFormSize(formId: string, newDimension: formInfo.FormDimension, newRect: formInfo.Rect): void;
+
+  /**
+   * Notify form lock state update.
+   *
+   * @permission ohos.permission.REQUIRE_FORM
+   * @param { string } formId - Indicates the form id.
+   * @param { boolean } isLocked - Indicates whether locked.
+   * @returns { Promise<void> } The promise returned by the function.
+   * @throws { BusinessError } 201 - Permissions denied.
+   * @throws { BusinessError } 202 - caller is not system app.
+   * @throws { BusinessError } 16500050 - IPC connection error.
+   * @throws { BusinessError } 16500060 - Service connection error.
+   * @throws { BusinessError } 16501000 - An internal functional error occurred.
+   * @throws { BusinessError } 16501001 - The ID of the form to be operated does not exist.
+   * @throws { BusinessError } 16501003 - The form cannot be operated by the current application.
+   * @syscap SystemCapability.Ability.Form
+   * @systemapi
+   * @since 18
+   */
+  function updateFormLockedState(formId: string, isLocked: boolean): Promise<void>;
 }
 export default formHost;