diff --git a/api/@ohos.systemTime.d.ts b/api/@ohos.systemTime.d.ts
index c6d1039d5f5def49f662d6bffb38724959e5a133..d69ec642af8bb6435ef764cdb3efa0374180dc65 100755
--- a/api/@ohos.systemTime.d.ts
+++ b/api/@ohos.systemTime.d.ts
@@ -17,13 +17,38 @@ import { AsyncCallback, ErrorCallback } from './basic';
 
 /**
  * System time and timezone.
- *
- * @since 6
+ * @since 7
+ * @sysCap SystemCapability.Miscservices.Time
+ * @devices phone, tablet, tv, wearable, car
+ * @import systemTime from '@ohos.systemTime';
  */
 declare namespace systemTime {
-    //  Sets the system time.
-    function setTime(time : number, callback : AsyncCallback<boolean>) : void;
-    function setTime(time : number) : Promise<boolean>;
+    /**
+     * Sets the system time.
+     * @permission ohos.permission.SET_TIME
+     * @param time Target time stamp (ms)
+     * @since 7
+     */
+    function setTime(time : number, callback : AsyncCallback<void>) : void;
+    function setTime(time : number) : Promise<void>;
+
+    /**
+     * Sets the system time.
+     * @permission ohos.permission.SET_TIME
+     * @param date The target date
+     * @since 7
+     */
+    function setDate(date: Date, callback: AsyncCallback<void>): void;
+    function setDate(date: Date): Promise<void>;
+
+    /**
+     * Sets the system time zone.
+     * @permission ohos.permission.SET_TIME_ZONE
+     * @param timezone The system time zone
+     * @since 7
+     */
+    function setTimezone(timezone: string, callback: AsyncCallback<void>): void;
+    function setTimezone(timezone: string): Promise<void>;
 }
 
 export default systemTime;
diff --git a/api/@ohos.systemTimer.d.ts b/api/@ohos.systemTimer.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..987f9067a8bc9701f2b30df7f5b0abcb87c8749a
--- /dev/null
+++ b/api/@ohos.systemTimer.d.ts
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { AsyncCallback, ErrorCallback } from './basic';
+import { WantAgent } from './@ohos.wantAgent';
+
+/**
+ * Provides js api for systemTimer
+ *
+ * @since 7
+ * @devices phone, tablet, tv, wearable, car
+ * @systemapi Hide this for inner system use.
+ */
+declare namespace systemTimer {
+  /**
+   * Indicates the timing policy the timer use, which can be REALTIME or UTC.
+   */
+  const TIMER_TYPE_REALTIME: number;
+
+  /**
+   * Describes whether a timer will wake the device up.
+   */
+  const TIMER_TYPE_WAKEUP: number;
+
+  /**
+   * Describes whether a timer will be delivered precisely at a scheduled time.
+   */
+  const TIMER_TYPE_EXACT: number;
+
+  /**
+   * Indicates whether the timer waking up the system is supported in low-power mode.
+   */
+  const TIMER_TYPE_IDLE: number;
+
+  /**
+   * Creates a timer.
+   * @Param options Indicates the timer options.
+   * @Return timer ID.
+   */
+  function createTimer(options: TimerOptions, callback: AsyncCallback<number>): void;
+  function createTimer(options: TimerOptions): Promise<number>;
+
+  /**
+   * Starts a timer.
+   *
+   * @Param timer The timer ID.
+   * @Param triggerTime Indicates the time at which the timer is triggered for the first time, in milliseconds.
+   *                    The time will be automatically set to 5000 milliseconds after the current time if the passed
+   *                    value is smaller than the current time plus 5000 milliseconds.
+   */
+  function startTimer(timer: number, triggerTime: number, callback: AsyncCallback<void>): void;
+  function startTimer(timer: number, triggerTime: number): Promise<void>;
+
+  /**
+   * Stops a timer.
+   * @Param timer The timer ID.
+   */
+  function stopTimer(timer: number, callback: AsyncCallback<void>): void;
+  function stopTimer(timer: number): Promise<void>;
+
+  /**
+   * Destroy a timer.
+   * @Param timer The timer ID.
+   */
+  function destroyTimer(timer: number, callback: AsyncCallback<void>): void;
+  function destroyTimer(timer: number): Promise<void>;
+
+    /**
+     * When the repeat is false,the interval is not needed, choose one of wantAgent and callback.
+     * When the repeat is true,the interval is required, the wantAgent is required, and the callback can be left blank.
+     *
+     */
+  interface TimerOptions {
+    /**
+     * timer type.
+     */
+    type: number;
+
+    /**
+     * Indicates a repeating timer
+     */
+    repeat: boolean;
+
+    /**
+     * Indicates the interval between two consecutive triggers, in milliseconds.
+     * The interval will be set to 5000 milliseconds automatically if the passed value is smaller than 5000.
+     */
+    interval?: number;
+
+    /**
+     * Indicates the intent to send when the timer goes off.
+     */
+    wantAgent?: WantAgent;
+
+    /**
+     * Called back when the timer goes off.
+     */
+    callback?: () => void;
+  }
+}
+
+export default systemTimer;
\ No newline at end of file