diff --git a/api/@ohos.thermal.d.ts b/api/@ohos.thermal.d.ts
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+/*
+ * 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, Callback } from './basic';
+
+/**
+ * Provides interfaces to obtain thermal information.
+ *
+ * @SysCap SystemCapability.PowerMgr.ThermalManager
+ * @since 7
+ */
+declare namespace thermal {
+    /**
+     * Enumerates the {@link ThermalLevel} types.
+     *
+     * @since 7
+     */
+    export enum ThermalLevel {
+        /**
+         * Indicates the device is cool.
+         */
+        COOL = 0,
+        /**
+         * Indicates the device is in normal working condition, but not cool.
+         */
+        NORMAL = 1,
+        /**
+         * Indicates the device is in a warm state.
+         */
+        WARM = 2,
+        /**
+         * Indicates the device is in a hot state.
+         */
+        HOT = 3,
+        /**
+         * Indicates the device is in a state of severe heating.
+         */
+        OVERHEATED = 4,
+        /**
+         * Indicates the device is about to enter a state of emergency.
+         */
+        WARNING = 5,
+        /**
+         * Indicates the device is in a state of emergency
+         * and must stop working immediately.
+         */
+        EMERGENCY = 6,
+    }
+    /**
+     * Subscribe to thermal level change notification.
+     *
+     * @param callback Specified callback method.
+     * @return Return thermal level.
+     * @since 7
+     */
+    function subscribeThermalLevel(callback: AsyncCallback<ThermalLevel>): void;
+
+    /**
+     * Cancel thermal level change subscription.
+     *
+     * @param callback Specified callback method.
+     * @return Null.
+     * @since 7
+     */
+    function unsubscribeThermalLevel(callback?: AsyncCallback<void>): void;
+
+    /**
+     * Get the current thermal level information.
+     *
+     * @return Return the thermal level value.
+     * @since 7
+     */
+    function getThermalLevel(): number;
+}
+export default thermal;