diff --git a/api/@ohos.storageStatistics.d.ts b/api/@ohos.storageStatistics.d.ts
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+++ b/api/@ohos.storageStatistics.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 storageStatistics {
+  /**
+   * Get the totalSize of volume.
+   *
+   * @since 8
+   */
+  function getTotalSizeOfVolume(volumeUuid: string, callback: AsyncCallback<number>): void;
+  function getTotalSizeOfVolume(volumeUuid: string): Promise<number>;
+  /**
+   * Get the free size Of volume.
+   * 
+   * @since 8
+   */
+  function getFreeSizeOfVolume(volumeUuid: string, callback: AsyncCallback<number>): void;
+  function getFreeSizeOfVolume(volumeUuid: string): Promise<number>;
+
+ /**
+   * Get the bundlestat 
+   * 
+   * @since 8
+   */
+
+ export interface BundleStats {
+  appSize: number;
+  cacheSize: number;
+  dataSize: number;
+}
+  function getBundleStats(volumeUuid: string, packageName: string,  callback: AsyncCallback<BundleStats>): void;
+  function getBundleStats(volumeUuid: string, packageName: string): Promise<BundleStats>;
+
+}
+
+export default storageStatistics;