diff --git a/api/@system.storage.d.ts b/api/@system.storage.d.ts
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+++ b/api/@system.storage.d.ts
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+/*
+ * Copyright (c) 2022 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 import storage from '@system.storage';
+ * @since 3
+ * @syscap SystemCapability.DistributedDataManager.Preferences.Core
+ */
+export interface GetStorageOptions {
+  /**
+   * Content index.
+   * For liteWearable and smartVision, the value contains a maximum of 32 characters and cannot contain special characters such as \/"*+,:;<=>?[]|\x7F.
+   * @since 3
+   */
+  key: string;
+
+  /**
+   * Default value returned when the key does not exist.
+   * If this parameter is not specified, an empty string is returned.
+   * @since 3
+   */
+  default?: string;
+
+  /**
+   * Called when the stored content is read successfully.
+   * @since 3
+   */
+  success?: (data: any) => void;
+
+  /**
+   * Called when the stored content fails to be read.
+   * @since 3
+   */
+  fail?: (data: string, code: number) => void;
+
+  /**
+   * Called when the execution is completed.
+   * @since 3
+   */
+  complete?: () => void;
+}
+
+/**
+ * @import import storage from '@system.storage';
+ * @since 3
+ * @syscap SystemCapability.DistributedDataManager.Preferences.Core
+ */
+export interface SetStorageOptions {
+  /**
+   * Index of the stored content to be modified.
+   * For liteWearable and smartVision, the value contains a maximum of 32 characters and cannot contain special characters such as \/"*+,:;<=>?[]|\x7F.
+   * @since 3
+   */
+  key: string;
+
+  /**
+   * Target storage content. If the content is an empty string, the data item with the key as the index will be deleted.
+   * @since 3
+   */
+  value: string;
+
+  /**
+   * Called when the stored content is modified successfully.
+   * @since 3
+   */
+  success?: () => void;
+
+  /**
+   * Called when the stored content fails to be modified.
+   * @since 3
+   */
+  fail?: (data: string, code: number) => void;
+
+  /**
+   * Called when the execution is completed.
+   * @since 3
+   */
+  complete?: () => void;
+}
+
+/**
+ * @import import storage from '@system.storage';
+ * @since 3
+ * @syscap SystemCapability.DistributedDataManager.Preferences.Core
+ */
+export interface ClearStorageOptions {
+  /**
+   * Called when the stored content is cleared successfully.
+   * @since 3
+   */
+  success?: () => void;
+
+  /**
+   * Called when the stored content fails to be cleared.
+   * @since 3
+   */
+  fail?: (data: string, code: number) => void;
+
+  /**
+   * Called when the execution is completed.
+   * @since 3
+   */
+  complete?: () => void;
+}
+
+/**
+ * @import import storage from '@system.storage';
+ * @since 3
+ * @syscap SystemCapability.DistributedDataManager.Preferences.Core
+ */
+export interface DeleteStorageOptions {
+  /**
+   * Content index.
+   * For liteWearable and smartVision, the value contains a maximum of 32 characters and cannot contain special characters such as \/"*+,:;<=>?[]|\x7F.
+   * @since 3
+   */
+  key: string;
+
+  /**
+   * Called when the stored content is deleted successfully.
+   * @since 3
+   */
+  success?: () => void;
+
+  /**
+   * Called when the stored content fails to be deleted.
+   * @since 3
+   */
+  fail?: (data: string, code: number) => void;
+
+  /**
+   * Called when the execution is completed.
+   * @since 3
+   */
+  complete?: () => void;
+}
+
+/**
+ * @import import storage from '@system.storage';
+ * @since 3
+ * @syscap SystemCapability.DistributedDataManager.Preferences.Core
+ */
+export default class Storage {
+  /**
+   * Reads the stored content.
+   * @param options Options.
+   */
+  static get(options: GetStorageOptions): void;
+
+  /**
+   * Modifies the stored content.
+   * @param options Options.
+   */
+  static set(options: SetStorageOptions): void;
+
+  /**
+   * Clears the stored content.
+   * @param options Options.
+   */
+  static clear(options?: ClearStorageOptions): void;
+
+  /**
+   * Deletes the stored content.
+   * @param options Options.
+   */
+  static delete(options: DeleteStorageOptions): void;
+}