diff --git a/api/@ohos.thermal.d.ts b/api/@ohos.thermal.d.ts
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+/*
+ * Copyright (c) 2022 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, Callback } from './basic';
+
+/**
+ * Provides thermal level-related callback and query APIs to obtain the information required for 
+ * temperature control. The APIs are as follows:
+ * {@link subscribeThermalLevel}: subscribes to callbacks of thermal level changes.
+ * {@link getThermalLevel}: obtains the thermal level of the system in real time.
+ *
+ * @syscap SystemCapability.PowerManager.ThermalManager
+ * @since 8
+ */
+declare namespace thermal {
+    /**
+     * Enumerates the {@link ThermalLevel} types.
+     *
+     * @since 8
+     */
+    export enum ThermalLevel {
+        /**
+         * The device is cool, and services are not restricted.
+         */
+        COOL = 0,
+        /**
+         * The device is operational but is not cool. You need to pay attention to its heating.
+         */
+        NORMAL = 1,
+        /**
+         * The device is warm. You need to stop or delay some imperceptible services.
+         */
+        WARM = 2,
+        /**
+         * The device is heating up. You need to stop all imperceptible services and downgrade 
+         * or reduce the load of other services.
+         */
+        HOT = 3,
+        /**
+         * The device is overheated. You need to stop all imperceptible services and downgrade 
+         * or reduce the load of major services.
+         */
+        OVERHEATED = 4,
+        /**
+         * The device is overheated and is about to enter the emergency state. You need to stop 
+         * all imperceptible services and downgrade major services to the maximum extent.
+         */
+        WARNING = 5,
+        /**
+         * The device has entered the emergency state. You need to stop all services except those 
+         * for the emergency help purposes.
+         */
+        EMERGENCY = 6,
+    }
+    /**
+     * Subscribes to callbacks of thermal level changes.
+     *
+     * @param callback Callback of thermal level changes.
+     * @return Returns the thermal level.
+     * @since 8
+     */
+    function subscribeThermalLevel(callback: AsyncCallback<ThermalLevel>): void;
+
+    /**
+     * Unsubscribes from the callbacks of thermal level changes.
+     *
+     * @param callback Callback of thermal level changes.
+      
+     * @since 8
+     */
+    function unsubscribeThermalLevel(callback?: AsyncCallback<void>): void;
+
+    /**
+     * Obtains the current thermal level.
+     *
+     * @return Returns the thermal level.
+     * @since 8
+     */
+    function getThermalLevel(): ThermalLevel;
+}
+export default thermal;