diff --git a/api/@ohos.statfs.d.ts b/api/@ohos.statfs.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 filesystem statistics APIs
+ *
+ * @since 8
+ * @sysCap N/A
+ * @devices phone, tablet
+ */
+declare namespace Statfs {
+  /**
+   * Get the number of free bytes on the specified path.
+   *
+   * @since 8
+   */
+  function getFreeBytes(path: string, callback: AsyncCallback<number>): void;
+  function getFreeBytes(path: string): Promise<number>;
+  /**
+   * Get the total number of bytes of the specified path.
+   *
+   * @since 8
+   */
+  function getTotalBytes(path: string, callback: AsyncCallback<number>): void;
+  function getTotalBytes(path: string): Promise<number>;
+}
+
+export default Statfs;