diff --git a/api/@ohos.data.distributeddatakit.d.ts b/api/@ohos.data.distributeddatakit.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..cb1c8d956a97ca06453aa75d79bfc5994e462152
--- /dev/null
+++ b/api/@ohos.data.distributeddatakit.d.ts
@@ -0,0 +1,63 @@
+/*
+ * 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';
+import { KVStore } from "./data/distributeddatakit/kvstore";
+import { Options } from "./data/distributeddatakit/plain_ordinary_js_objects";
+import { KVManagerConfig } from './data/distributeddatakit/kvmanager_config'
+
+declare namespace distributedDataKit {
+    /**
+     * Creates a {@link KVManager} instance based on the configuration information.
+     *
+     * <p>You must pass {@link KVManagerConfig} to provide configuration information
+     * for creating the {@link KVManager} instance.
+     *
+     * @param config Indicates the {@link KVStore} configuration information,
+     * including the user information and package name.
+     * @return Returns the {@code KVManager} instance.
+     * @throws Throws exception if input is invalid.
+     * @since 7
+     */
+    function createKVManager(config: KVManagerConfig, callback: AsyncCallback<KVManager>): void;
+    function createKVManager(config: KVManagerConfig): Promise<KVManager>;
+
+    /**
+     * Provides interfaces to manage a {@code KVStore} database,
+     * including obtaining, closing, and deleting the {@code KVStore}.
+     *
+     * @devices phone, tablet
+     * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+     * @since 7
+     * @version 1
+     */
+    interface KVManager {
+        /**
+         * Creates and obtains a {@code KVStore} database by specifying {@code Options} and {@code storeId}.
+         *
+         * @param options Indicates the options used for creating and obtaining the {@code KVStore} database,
+         * including {@code isCreateIfMissing}, {@code isEncrypt}, and {@code KVStoreType}.
+         * @param storeId Identifies the {@code KVStore} database.
+         * The value of this parameter must be unique for the same application,
+         * and different applications can share the same value.
+         * @return Returns a {@code KVStore}, or {@code SingleKVStore},
+         * @since 7
+         */
+        getKVStore<T extends KVStore>(storeId: string, options: Options): Promise<T>;
+        getKVStore<T extends KVStore>(storeId: string, options: Options, callback: AsyncCallback<T>): void;
+    }
+}
+
+export default distributedDataKit;
\ No newline at end of file
diff --git a/api/data/distributeddatakit/kvmanager_config.d.ts b/api/data/distributeddatakit/kvmanager_config.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..643aa1c2aa75bc79ee2a3a615efae974c9cdc24c
--- /dev/null
+++ b/api/data/distributeddatakit/kvmanager_config.d.ts
@@ -0,0 +1,61 @@
+/*
+ * 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.
+ */
+
+/**
+ * Provides configuration information for {@link KVManager} instances,
+ * including the caller's package name and distributed network type.
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @devices phone, tablet
+ * @since 7
+ */
+export interface KVManagerConfig {
+    /**
+     * Indicates the user information
+     */
+    userInfo: UserInfo;
+
+    /**
+     * Indicates the bundleName
+     */
+    bundleName: string;
+}
+
+/**
+ * Manages user information.
+ *
+ * <p>This class provides methods for obtaining the user ID and type, setting the user ID and type,
+ * and checking whether two users are the same.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @since 7
+ */
+export interface UserInfo {
+    /** Indicates the user ID to set */
+    userId?: string;
+
+    /** Indicates the user type to set */
+    userType?: UserType;
+}
+
+/**
+ * Enumerates user types.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @since 7
+ */
+export enum UserType {
+    /** Indicates a user that logs in to different devices using the same account. */
+    SAME_USER_ID = 0
+}
\ No newline at end of file
diff --git a/api/data/distributeddatakit/kvstore.d.ts b/api/data/distributeddatakit/kvstore.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..6f6da977f73e03820ceaa6886ffc68a7e8c81532
--- /dev/null
+++ b/api/data/distributeddatakit/kvstore.d.ts
@@ -0,0 +1,111 @@
+/*
+ * 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';
+import { ChangeNotification, SubscribeType } from "./plain_ordinary_js_objects";
+
+/**
+ * Represents a key-value distributed database and provides methods for adding, deleting, modifying, querying,
+ * and subscribing to distributed data.
+ *
+ * <p>You can create distributed databases of different types by {@link KVManager#getKVStore (Options, String)}
+ * with input parameter {@code Options}. Distributed database types are defined in {@code KVStoreType},
+ * including {@code SingleKVStore}.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @devices phone, tablet
+ * @since 7
+ * @version 1
+ */
+export interface KVStore {
+    /**
+     * Writes a key-value pair of the byte array type into the {@code KVStore} database.
+     *
+     * @param key Indicates the key. The length must be less than {@code MAX_KEY_LENGTH}.
+     * Spaces before and after the key will be cleared.
+     * @param value Indicates the byte array, which must be less than 4 MB.
+     * @return Returns the error code of databases.
+     * @since 7
+     */
+    put(key: string, value: Uint8Array | string | number | boolean, callback: AsyncCallback<void>): void;
+    put(key: string, value: Uint8Array | string | number | boolean): Promise<void>;
+
+    /**
+     * Deletes the key-value pair based on a specified key.
+     *
+     * @param key Indicates the key. The length must be less than {@code MAX_KEY_LENGTH}.
+     * Spaces before and after the key will be cleared.
+     * @return Returns the error code of databases.
+     * @since 7
+     */
+    delete(key: string, callback: AsyncCallback<void>): void;
+    delete(key: string): Promise<void>;
+
+    /**
+     * turn on from the data change notify based on the specified {@code subscribeType}.
+     *
+     * @param type Indicates the subscription type, which is defined in {@code SubscribeType}.
+     * @param observer Indicates the observer of data change events in the distributed database.
+     * @return Returns the error code of databases.
+     * @since 7
+     */
+    on(event: 'dataChange', type: SubscribeType, observer: Callback<ChangeNotification>): void;
+
+    /**
+     * Subscribe to the notification of store synchronization completion.
+     *
+     * <p>Sync result is returned through asynchronous callback.
+     *
+     * @param syncCallback Indicates the callback used to send the synchronization result to the caller.
+     * @return Returns the {@code number} object.
+     * @since 7
+     */
+    on(event: 'syncComplete', syncCallback: Callback<Array<[string, number]>>): void;
+}
+
+/**
+ * KVStore constants
+ */
+export module Constants {
+    /**
+    * max key length.
+    */
+    const MAX_KEY_LENGTH = 1024;
+
+    /**
+     * max value length.
+     */
+    const MAX_VALUE_LENGTH = 4194303;
+
+    /**
+     * max device coordinate key length.
+     */
+    const MAX_KEY_LENGTH_DEVICE = 896;
+
+    /**
+     * max store id length.
+     */
+    const MAX_STORE_ID_LENGTH = 128;
+
+    /**
+     * max query length.
+     */
+    const MAX_QUERY_LENGTH = 512000;
+
+    /**
+     * max batch operation size.
+     */
+    const MAX_BATCH_SIZE = 128;
+}
\ No newline at end of file
diff --git a/api/data/distributeddatakit/plain_ordinary_js_objects.d.ts b/api/data/distributeddatakit/plain_ordinary_js_objects.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..efcfd56078874d8e8f54f3ac0abb3360f21d3303
--- /dev/null
+++ b/api/data/distributeddatakit/plain_ordinary_js_objects.d.ts
@@ -0,0 +1,215 @@
+/*
+ * 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.
+ */
+/**
+ * Obtains {@code Value} objects stored in a {@link KVStore} database.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @devices phone, tablet
+ * @since 7
+ */
+export interface Value {
+    /**
+     * Indicates value type
+     *
+     * @see ValueType
+     * @type {number}
+     * @memberof Value
+     */
+    type: ValueType;
+    value: Uint8Array | string | number | boolean;
+}
+
+/**
+ * Provides key-value pairs stored in the distributed database.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @devices phone, tablet
+ * @since 7
+ */
+export interface Entry {
+    key: string;
+    value: Value;
+}
+
+/**
+ * Receives notifications of all data changes, including data insertion, update, and deletion.
+ *
+ * <p>If you have subscribed to {@code KVStore}, you will receive data change notifications and obtain the changed data
+ * from the parameters in callback methods upon data insertion, update, or deletion.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @devices phone, tablet
+ * @since 7
+ */
+export interface ChangeNotification {
+    /** Indicates data addition records. */
+    insertEntries: Entry[];
+    /** Indicates data update records. */
+    updateEntries: Entry[];
+    /** Indicates data deletion records. */
+    deleteEntries: Entry[];
+    /** Indicates from device id. */
+    deviceId: string;
+}
+
+/**
+ * Describes the subscription type.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @devices phone, tablet
+ * @since 7
+ */
+export enum SubscribeType {
+    /** Subscription to local data changes */
+    SUBSCRIBE_TYPE_LOCAL = 0,
+
+    /** Subscription to remote data changes */
+    SUBSCRIBE_TYPE_REMOTE = 1,
+
+    /** Subscription to both local and remote data changes */
+    SUBSCRIBE_TYPE_ALL = 2,
+}
+
+/**
+ * Describes the {@code KVStore} type.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @since 7
+ */
+export enum KVStoreType {
+    /** Device-collaborated database, as specified by {@code DeviceKVStore} */
+    DEVICE_COLLABORATION = 0,
+
+    /** Single-version database, as specified by {@code SingleKVStore} */
+    SINGLE_VERSION = 1,
+
+    /** Multi-version database, as specified by {@code MultiKVStore} */
+    MULTI_VERSION = 2,
+}
+
+/**
+ * Describes the {@code KVStore} type.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @since 7
+ */
+export enum SecurityLevel {
+    /**
+     * NO_LEVEL: mains not set the security level.
+     *
+     * @since 7
+     */
+    NO_LEVEL = 0,
+
+    /**
+     * S0: mains the db is public.
+     * There is no impact even if the data is leaked.
+     *
+     * @since 7
+     */
+    S0 = 1,
+
+    /**
+     * S1: mains the db is low level security
+     * There are some low impact, when the data is leaked.
+     *
+     * @since 7
+     */
+    S1 = 2,
+
+    /**
+     * S2: mains the db is middle level security
+     * There are some major impact, when the data is leaked.
+     *
+     * @since 7
+     */
+    S2 = 3,
+
+    /**
+     * S3: mains the db is high level security
+     * There are some severity impact, when the data is leaked.
+     *
+     * @since 7
+     */
+    S3 = 5,
+
+    /**
+     * S4: mains the db is critical level security
+     * There are some critical impact, when the data is leaked.
+     *
+     * @since 7
+     */
+    S4 = 6,
+}
+
+/**
+ * Provides configuration options for creating a {@code KVStore}.
+ *
+ * <p>You can determine whether to create another database if a {@code KVStore} database is missing,
+ * whether to encrypt the database, and the database type.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @since 7
+ */
+export interface Options {
+    createIfMissing?: boolean;
+    encrypt?: boolean;
+    backup?: boolean;
+    autoSync?: boolean;
+    kvStoreType?: KVStoreType;
+    securityLevel?: SecurityLevel;
+}
+
+/**
+ * Indicates the database synchronization mode.
+ *
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @since 7
+ */
+export enum SyncMode {
+    /** Indicates that data is only pulled from the remote end. */
+    PULL_ONLY = 0,
+    /** Indicates that data is only pushed from the local end. */
+    PUSH_ONLY = 1,
+    /** Indicates that data is pushed from the local end, and then pulled from the remote end. */
+    PUSH_PULL = 2
+}
+
+/**
+ * Indicates the {@code ValueType}.
+ *
+ * <p>{@code ValueType} is obtained based on the value.
+ *
+ * @since 7
+ */
+export enum ValueType {
+    /** Indicates that the value type is string. */
+    STRING = 0,
+
+    /** Indicates that the value type is int. */
+    INTEGER = 1,
+
+    /** Indicates that the value type is float. */
+    FLOAT = 2,
+
+    /** Indicates that the value type is byte array. */
+    BYTE_ARRAY = 3,
+
+    /** Indicates that the value type is boolean. */
+    BOOLEAN = 4,
+
+    /** Indicates that the value type is double. */
+    DOUBLE = 5
+}
diff --git a/api/data/distributeddatakit/single_kvstore.d.ts b/api/data/distributeddatakit/single_kvstore.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..a631e52d24c9ebbb7babb70463670a648167ac88
--- /dev/null
+++ b/api/data/distributeddatakit/single_kvstore.d.ts
@@ -0,0 +1,59 @@
+/*
+ * 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';
+import { KVStore } from "./kvstore";
+import { SyncMode } from "./plain_ordinary_js_objects";
+
+/**
+ * Provides methods related to single-version distributed databases.
+ *
+ * <p>To create a {@code SingleKVStore} database,
+ * you can use the {@link data.distributed.common.KVManager#getKVStore​(Options, String)} method
+ * with {@code KVStoreType} set to {@code SINGLE_VERSION} for the input parameter {@code Options}.
+ * This database synchronizes data to other databases in time sequence.
+ * The {@code SingleKVStore} database does not support
+ * synchronous transactions, or data search using snapshots.
+ *
+ * @devices phone, tablet
+ * @Syscap SystemCapability.Data.DATA_DISTRIBUTEDDATAMGR
+ * @since 7
+ * @version 1
+ */
+export interface SingleKVStore extends KVStore {
+    /**
+     * Obtains the value of a specified key.
+     *
+     * @param key Indicates the key of the value to be queried.
+     * @return Returns the value matching the given criteria.
+     * @throws Throws exception if any of the following errors occurs: {@code INVALID_ARGUMENT},
+     * {@code SERVER_UNAVAILABLE}, {@code IPC_ERROR}, {@code DB_ERROR}, and {@code KEY_NOT_FOUND}.
+     * @since 7
+     */
+    get(key: string, callback: AsyncCallback<Uint8Array | string | boolean | number>): void;
+    get(key: string): Promise<Uint8Array | string | boolean | number>;
+
+    /**
+     * Synchronizing KVStore Data Between Devices.
+     *
+     * @param deviceIdList Indicates the {@code string}.
+     * @param mode Indicates the {@code SyncMode} object.
+     * @param allowedDelayMs Indicates the number type parameter.
+     * @return Returns the {@code number} object.
+     * @since 7
+     */
+    sync(deviceIdList: string[], mode: SyncMode, allowedDelayMs?: number): void;
+}
+
+