diff --git a/api/@ohos.multimodalInput.inputConsumer.d.ts b/api/@ohos.multimodalInput.inputConsumer.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 } from './basic';
+
+ /**
+ * The event of key input management module is configured to subscribe and unsubscribe system keys.
+ *
+ * @since 8
+ * @sysCap SystemCapability.MultimodalInput.MULTIMODAL_INPUT
+ * @devices phone, tablet, tv, wearable
+ * @import import inputConsumer from '@ohos.multimodalInput.inputConsumer';
+ * @permission N/A
+ */
+
+declare namespace inputConsumer {
+    /**
+     * Defines event of key that user want to subscribe or unsubscribe.
+     *
+     * @sysCap SystemCapability.MultimodalInput.MULTIMODAL_INPUT
+     * @param preKeys The pre-keys that want to subscribe or unsubscribe.
+     * @param finalKey The post position key that want to subscribe or unsubscribe.
+     * @param isFinalKeyDown The final key press down or up.
+     * @param finalKeyDownDuration Duration of final key press.
+     */
+    interface KeyOptions {
+        preKeys: Array<number>;
+        finalKey: number;
+        isFinalKeyDown: boolean;
+        finalKeyDownDuration: number;
+    }
+
+    /**
+     * Subscribe system keys.
+     *
+     * @since 8
+     * @sysCap SystemCapability.MultimodalInput.MULTIMODAL_INPUT
+     * @devices phone, tablet, tv, wearable
+     * @permission N/A
+     * @param type type of the keyevent about input which is to be subscribed.
+     * @param keyOption the key events about input which is to be subscribed.
+     * @param callback callback function, receive reported data.
+     */
+    function on(type: string, keyOption: KeyOptions, callback: AsyncCallback<KeyOptions>): void;
+
+    /**
+     * Subscribe system keys.
+     *
+     * @since 8
+     * @sysCap SystemCapability.MultimodalInput.MULTIMODAL_INPUT
+     * @devices phone, tablet, tv, wearable
+     * @permission N/A
+     * @param type type of the keyevent about input which is to be subscribed.
+     * @param keyOption the key events about input which is to be subscribed.
+     * @param callback callback function, receive reported data.
+     */
+    function off(type: string, keyOption: KeyOptions, callback: AsyncCallback<KeyOptions>): void;
+}
+
+export default inputConsumer;
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