diff --git a/api/@ohos.fileManager.d.ts b/api/@ohos.fileManager.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'
+
+export default filemanager;
+
+/**
+ * @devices phone, tablet, tv, wearable
+ */
+declare namespace filemanager {
+    export { listFile };
+    export { getRoot };
+    export { createFile };
+    export { FileInfo };
+    export { DevInfo };
+}
+
+/**
+ * listFile.
+ *
+ * @note N/A
+ * @sysCap SystemCapability.FileManagement.FileManagerService
+ * @since 8
+ * @permission N/A
+ * @function listFile
+ * @param {string} path - path.
+ * @param {string} type - type.
+ * @param {Object} options - options
+ * @param {DevInfo} [options.dev = {name: "local"}] - dev name.
+ * @param {number} [options.offset = 0] - offset.
+ * @param {number} [options.count = 0] - count.
+ * @param {AsyncCallback} [callback] - callback.
+ * @returns {void | Promise<FileInfo[]>} no callback return Promise otherwise return void
+ * @throws {TypedError} Parameter check failed
+ */
+declare function listFile(path: string, type: string, options?: {dev?: DevInfo, offset?: number, count?: number}): Promise<FileInfo[]>;
+declare function listFile(path: string, type: string, options?: {dev?: DevInfo, offset?: number, count?: number}, AsyncCallback<FileInfo[]>): void;
+
+/**
+ * getRoot.
+ *
+ * @note N/A
+ * @sysCap SystemCapability.FileManagement.FileManagerService
+ * @since 8
+ * @permission N/A
+ * @function getRoot
+ * @param {Object} options - options
+ * @param {DevInfo} [options.dev = {name: "local"}] - dev name.
+ * @param {AsyncCallback} [callback] - callback.
+ * @returns {void | Promise<FileInfo>} no callback return Promise otherwise return void
+ * @throws {TypedError} Parameter check failed
+ */
+declare function getRoot(options?: {dev?: DevInfo}): Promise<FileInfo[]>;
+declare function getRoot(options?: {dev?: DevInfo}, callback: AsyncCallback<FileInfo[]>): void;
+
+/**
+ * createFile.
+ *
+ * @note N/A
+ * @sysCap SystemCapability.FileManagement.FileManagerService
+ * @since 8
+ * @permission N/A
+ * @function createFile
+ * @param {string} path - album uri.
+ * @param {string} filename- file name.
+ * @param {Object} options - options
+ * @param {DevInfo} [options.dev = {name: "local"}] - dev name.
+ * @param {AsyncCallback} [callback] - callback.
+ * @returns {void | Promise<string>} no callback return Promise otherwise return void
+ * @throws {TypedError} Parameter check failed
+ */
+declare function createFile(path: string, filename: string, options?: {dev?: DevInfo}): Promise<string>;
+declare function createFile(path: string, filename: string, options?: {dev?: DevInfo}, callback: AsyncCallback<string>): void;
+
+/**
+ * FileInfo
+ * @note N/A
+ * @sysCap SystemCapability.FileManagement.FileManagerService
+ * @since 8
+ * @permission N/A
+ * @devices phone, tablet, tv, wearable
+ */
+declare interface FileInfo {
+    /**
+     * @type {string}
+     * @readonly
+     */
+    name: string;
+    /**
+     * @type {string}
+     * @readonly
+     */
+    path: string;
+    /**
+     * @type {string}
+     * @readonly
+     */
+    type: string;
+    /**
+     * @type {string}
+     * @readonly
+     */
+    size: number;
+    /**
+     * @type {string}
+     * @readonly
+     */
+    addedTime: number;
+    /**
+     * @type {string}
+     * @readonly
+     */
+    modifiedTime: number;
+}
+
+/**
+ * DevInfo
+ * @note N/A
+ * @sysCap SystemCapability.FileManagement.FileManagerService
+ * @since 8
+ * @permission N/A
+ * @devices phone, tablet, tv, wearable
+ */
+ declare interface DevInfo {
+    /**
+     * @type {string}
+     */
+     name: string;
+ }