diff --git a/api/@ohos.screenLock.d.ts b/api/@ohos.screenLock.d.ts
index f1be748d76e6166c0ab4f7f3cb1c53e80855c4b9..8bf686a2f9ffeb97c8112f7e1ce3a995a1c220bc 100644
--- a/api/@ohos.screenLock.d.ts
+++ b/api/@ohos.screenLock.d.ts
@@ -50,6 +50,14 @@ declare namespace screenLock {
   function unlockScreen(callback: AsyncCallback<void>): void;
   function unlockScreen():Promise<void>;
 
+  /**
+   * Lock the screen.
+   * @systemapi Hide this for inner system use.
+   * @since 9
+   */
+  function lockScreen(callback: AsyncCallback<boolean>): void;
+  function lockScreen():Promise<boolean>;
+
   /**
    * Receives {beginWakeUp|endWakeUp|beginScreenOn|endScreenOn|beginScreenOff|endScreenOff|unlockScreen|beginExitAnimation} called. 
    * This callback is invoked when {beginWakeUp|endWakeUp|beginScreenOn|endScreenOn|beginScreenOff|endScreenOff|unlockScreen|beginExitAnimation}