diff --git a/en/application-dev/reference/apis/js-apis-distributed-data.md b/en/application-dev/reference/apis/js-apis-distributed-data.md
index eff79b5dbed8a643cb3651b594df6a5db4336b07..cd25c298b90c6f59cba4e2d86f79650991eb7ab8 100644
--- a/en/application-dev/reference/apis/js-apis-distributed-data.md
+++ b/en/application-dev/reference/apis/js-apis-distributed-data.md
@@ -9,7 +9,7 @@ This module provides the following functions:
 - [Query<sup>8+</sup>](#query8): provides methods to query data from the database through a **Query** instance by using predicates.
 - [KVStore](#kvstore): provides methods to add data, delete data, and observe data changes and data synchronization through a **KVStore** instance.
 - [SingleKVStore](#singlekvstore): provides methods to query and synchronize data in a single KV store. This class inherits from [KVStore](#kvstore), and data is not distinguished by device.
-- [DeviceKVStore<sup>8+</sup> ](#devicekvstore8): provides methods to query and synchronize data in a device KV store. This class inherits from [KVStore](#kvstore), and data is distinguished by device.
+- [DeviceKVStore<sup>8+</sup>](#devicekvstore8): provides methods to query and synchronize data in a device KV store. This class inherits from [KVStore](#kvstore), and data is distinguished by device.
 
 >**NOTE**
 >
@@ -128,8 +128,8 @@ Defines user information.
 
 | Name| Type| Mandatory| Description|
 | ----- | ------ |------ | ------ |
-| userId | string | No | User ID.|
-| userType | [UserType](#usertype) | No | User type.|
+| userId | string | No | User ID. The default value is **0**.|
+| userType | [UserType](#usertype) | No | User type. The default value is **0**.|
 
 
 ## UserType
@@ -267,7 +267,7 @@ const options = {
     backup: false,
     autoSync: true,
     kvStoreType: distributedData.KVStoreType.SINGLE_VERSION,
-    schema: '',
+    schema: undefined,
     securityLevel: distributedData.SecurityLevel.S2,
 }
 try {
@@ -317,7 +317,7 @@ const options = {
     backup: false,
     autoSync: true,
     kvStoreType: distributedData.KVStoreType.SINGLE_VERSION,
-    schema: '',
+    schema: undefined,
     securityLevel: distributedData.SecurityLevel.S2,
 }
 try {
@@ -365,7 +365,7 @@ const options = {
     backup : false,
     autoSync : true,
     kvStoreType : distributedData.KVStoreType.SINGLE_VERSION,
-    schema : '',
+    schema : undefined,
     securityLevel : distributedData.SecurityLevel.S2,
 }
 try {
@@ -414,7 +414,7 @@ const options = {
     backup : false,
     autoSync : true,
     kvStoreType : distributedData.KVStoreType.SINGLE_VERSION,
-    schema : '',
+    schema : undefined,
     securityLevel : distributedData.SecurityLevel.S2,
 }
 try {
@@ -548,7 +548,7 @@ Unsubscribes from service status changes.
 | Name | Type| Mandatory | Description                   |
 | -----  | ------  | ----  | ----------------------- |
 | event  | string | Yes   | Event to unsubscribe from. The value is **distributedDataServiceDie**, which indicates a service status change event.|
-| deathCallback  | Callback&lt;void&gt;  | No   | Callback for the service status change event.|
+| deathCallback  | Callback&lt;void&gt;  | No   | Callback for the service status change event. If the callback is not specified, all subscriptions to the service status change event are canceled.|
 
 
 **Example**
@@ -574,13 +574,13 @@ Provides KV store configuration.
 
 | Name | Type| Mandatory  | Description                   |
 | -----  | ------  | ------  | -------------------|
-| createIfMissing  | boolean | No| Whether to create a KV store if no database file exists. By default, a KV store is created.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
-| encrypt  | boolean | No|Whether to encrypt database files. By default, database files are not encrypted.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core    |
-| backup  | boolean | No|Whether to back up database files. By default, database files are backed up. <br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
-| autoSync  | boolean | No|Whether to automatically synchronize database files. The value **false** (default) means to manually synchronize database files; the value **true** means to automatically synchronize database files.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core<br>**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC    |
-| kvStoreType | [KVStoreType](#kvstoretype) | No|Type of the KV store to create. By default, a device KV store is created. The device KV store stores data for multiple devices that collaborate with each other.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
-| securityLevel | [SecurityLevel](#securitylevel) | No|Security level of the KV store. By default, the security level is not set.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core |
-| schema<sup>8+</sup> | [Schema](#schema8) | No| Schema used to define the values stored in a KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.DistributedKVStore|
+| createIfMissing  | boolean | No| Whether to create a KV store if the database file does not exist. The default value is **true**, which means to create a KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
+| encrypt  | boolean | No|Whether to encrypt the KV store. The default value is **false**, which means the KV store is not encrypted.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core    |
+| backup  | boolean | No|Whether to back up the KV store. The default value is **true**, which means to back up the KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
+| autoSync  | boolean | No|Whether to automatically synchronize database files. The default value is **false**, which means the database files are manually synchronized.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core<br>**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC    |
+| kvStoreType | [KVStoreType](#kvstoretype) | No|Type of the KV store to create. The default value is **DEVICE_COLLABORATION**, which indicates a device KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
+| securityLevel | [SecurityLevel](#securitylevel) | Yes|Security level (S1 to S4) of the KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core |
+| schema<sup>8+</sup> | [Schema](#schema8) | No| Schema used to define the values stored in the KV store. The default value is **undefined**, which means no schema is used.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.DistributedKVStore|
 
 
 ## KVStoreType
@@ -601,12 +601,12 @@ Enumerates the KV store security levels.
 
 | Name | Value| Description                   |
 | ---   | ----  | ----------------------- |
-| NO_LEVEL  | 0 | No security level is set for the KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.DistributedKVStore  |
-| S0  | 1 | The KV store security level is public.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
-| S1  | 2 | The KV store security level is low. If data leakage occurs, minor impact will be caused on the database. For example, a KV store that contains system data such as wallpapers.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
-| S2  | 3 | The KV store security level is medium. If data leakage occurs, moderate impact will be caused on the database. For example, a KV store that contains information created by users or call records, such as audio or video clips.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
-| S3  | 5 | The KV store security level is high. If data leakage occurs, major impact will be caused on the database. For example, a KV store that contains information such as user fitness, health, and location data.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
-| S4  | 6 | The KV store security level is critical. If data leakage occurs, severe impact will be caused on the database. For example, a KV store that contains information such as authentication credentials and financial data.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
+| NO_LEVEL  | 0 | No security level is set for the KV store (deprecated).<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.DistributedKVStore  |
+| S0  | 1 | The KV store security level is public (deprecated).<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
+| S1  | 2 | The KV store security level is low. If data leakage occurs, minor impact will be caused. For example, a KV store that contains system data such as wallpapers.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
+| S2  | 3 | The KV store security level is medium. If data leakage occurs, moderate impact will be caused. For example, a KV store that contains information created by users or call records such as audio or video clips.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
+| S3  | 5 | The KV store security level is high. If data leakage occurs, major impact will be caused. For example, a KV store that contains information such as user fitness, health, and location data.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
+| S4  | 6 | The KV store security level is critical. If data leakage occurs, severe impact will be caused. For example, a KV store that contains information such as authentication credentials and financial data.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core   |
 
 
 ## Constants
@@ -1686,7 +1686,7 @@ Creates a **Query** object with the AND condition.
 
 | Type   | Description      |
 | ------  | -------   |
-| [Query](#query8) |**Query** object Created.|
+| [Query](#query8) |**Query** object created.|
 
 **Example**
 
@@ -1716,7 +1716,7 @@ Creates a **Query** object with the OR condition.
 
 | Type   | Description      |
 | ------  | -------   |
-| [Query](#query8) |**Query** object Created.|
+| [Query](#query8) |**Query** object created.|
 
 **Example**
 
@@ -2295,7 +2295,7 @@ Unsubscribes from data changes.
 | Name  | Type                                                     | Mandatory| Description                                                    |
 | -------- | --------------------------------------------------------- | ---- | -------------------------------------------------------- |
 | event    | string                                                    | Yes  | Event to unsubscribe from. The value is **dataChange**, which indicates a data change event.|
-| listener |Callback&lt;[ChangeNotification](#changenotification)&gt; |No   |Callback for the data change event.|
+| listener | Callback&lt;[ChangeNotification](#changenotification)&gt; | No  | Callback for the data change event. If the callback is not specified, all subscriptions to the data change event are canceled.|
 
 
 
@@ -2333,7 +2333,7 @@ Unsubscribes from synchronization complete events.
 | Name      | Type                                         | Mandatory| Description                                                      |
 | ------------ | --------------------------------------------- | ---- | ---------------------------------------------------------- |
 | event        | string                                        | Yes  | Event to unsubscribe from. The value is **syncComplete**, which indicates a synchronization complete event.|
-| syncCallback  |Callback&lt;Array&lt;[string, number]&gt;&gt;   | No   |Callback for the synchronization complete event.   |
+| syncCallback | Callback&lt;Array&lt;[string, number]&gt;&gt; | No  | Callback for the synchronization complete event. If the callback is not specified, all subscriptions to the synchronization complete event are canceled.|
 
 **Example**
 
@@ -3895,7 +3895,7 @@ Unsubscribes from data changes.
 | Name  | Type                                                     | Mandatory| Description                                                    |
 | -------- | --------------------------------------------------------- | ---- | -------------------------------------------------------- |
 | event    | string                                                    | Yes  | Event to unsubscribe from. The value is **dataChange**, which indicates a data change event.|
-| listener |Callback&lt;[ChangeNotification](#changenotification)&gt; |No   |Callback for the data change event.|
+| listener | Callback&lt;[ChangeNotification](#changenotification)&gt; | No  | Callback for the data change event. If the callback is not specified, all subscriptions to the data change event are canceled.|
 
 **Example**
 
@@ -3931,7 +3931,7 @@ Unsubscribes from synchronization complete events.
 | Name      | Type                                         | Mandatory| Description                                                      |
 | ------------ | --------------------------------------------- | ---- | ---------------------------------------------------------- |
 | event        | string                                        | Yes  | Event to unsubscribe from. The value is **syncComplete**, which indicates a synchronization complete event.|
-| syncCallback | Callback&lt;Array&lt;[string, number]&gt;&gt; | No  | Callback for the synchronization complete event.                |
+| syncCallback | Callback&lt;Array&lt;[string, number]&gt;&gt; | No  | Callback for the synchronization complete event. If the callback is not specified, all subscriptions to the synchronization complete event are canceled. |
 
 **Example**
 
@@ -5258,7 +5258,7 @@ Synchronizes the KV store manually.
 | -----  | ------   | ----  | ----------------------- |
 | deviceIds    |string[]               | Yes   |IDs of the devices to be synchronized.|
 | mode            |[SyncMode](#syncmode)  | Yes   |Synchronization mode. |
-| delayMs  |number                 | No   |Allowed synchronization delay time, in ms. |
+| delayMs  |number                 | No   |Allowed synchronization delay time, in ms. The default value is **0**. |
 
 **Example**
 
@@ -5373,7 +5373,7 @@ Unsubscribes from data changes.
 | Name  | Type                                                     | Mandatory| Description                                                    |
 | -------- | --------------------------------------------------------- | ---- | -------------------------------------------------------- |
 | event    | string                                                    | Yes  | Event to unsubscribe from. The value is **dataChange**, which indicates a data change event.|
-| listener |Callback&lt;[ChangeNotification](#changenotification)&gt; |No   |Callback for the data change event.|
+| listener | Callback&lt;[ChangeNotification](#changenotification)&gt; | No  | Callback for the data change event. If the callback is not specified, all subscriptions to the data change event are canceled.|
 
 **Example**
 
@@ -5409,7 +5409,7 @@ Unsubscribes from synchronization complete events.
 | Name      | Type                                         | Mandatory| Description                                                      |
 | ------------ | --------------------------------------------- | ---- | ---------------------------------------------------------- |
 | event        | string                                        | Yes  | Event to unsubscribe from. The value is **syncComplete**, which indicates a synchronization complete event.|
-| syncCallback | Callback&lt;Array&lt;[string, number]&gt;&gt; | No  | Callback for the synchronization complete event.                |
+| syncCallback | Callback&lt;Array&lt;[string, number]&gt;&gt; | No  | Callback for the synchronization complete event. If the callback is not specified, all subscriptions to the synchronization complete event are canceled. |
 
 **Example**
 
diff --git a/en/application-dev/reference/apis/js-apis-distributedKVStore.md b/en/application-dev/reference/apis/js-apis-distributedKVStore.md
index d1911570c6460214f6d814583359a889dd75d8c8..117afe8d4f70bb034add259da1a09d3b58b680ba 100644
--- a/en/application-dev/reference/apis/js-apis-distributedKVStore.md
+++ b/en/application-dev/reference/apis/js-apis-distributedKVStore.md
@@ -12,8 +12,8 @@ The **distributedKVStore** module provides the following functions:
 
 > **NOTE**
 >
-> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
-> <br>All the APIs that need to obtain **deviceId** in this module are available only to system applications.
+> - The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+> - All the APIs that need to obtain **deviceId** in this module are available only to system applications.
 
 ## Modules to Import
 
@@ -41,7 +41,7 @@ Provides constants of the distributed KV store.
 | Name                 | Value     | Description                                   |
 | --------------------- | ------- | --------------------------------------- |
 | MAX_KEY_LENGTH        | 1024    | Maximum length of a key in a distributed KV store, in bytes.  |
-| MAX_VALUE_LENGTH      | 4194303 | Maximum length of a value in a distributed KV store, in bytes. |
+| MAX_VALUE_LENGTH      | 4194303 | Maximum length of a value in a distributed KV store, in bytes.|
 | MAX_KEY_LENGTH_DEVICE | 896     | Maximum length of a key in a device KV store, in bytes.|
 | MAX_STORE_ID_LENGTH   | 128     | Maximum length of a KV store ID, in bytes. |
 | MAX_QUERY_LENGTH      | 512000  | Maximum query length, in bytes.               |
@@ -127,7 +127,7 @@ Enumerates the distributed KV store types.
 
 | Name                | Description                                                        |
 | -------------------- | ------------------------------------------------------------ |
-| DEVICE_COLLABORATION | Device KV store.<br>The device KV store manages data by device, which eliminates conflicts. Data can be queried by device.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.DistributedKVStore|
+| DEVICE_COLLABORATION | Device KV store.<br>The device KV store manages data by device, which eliminates conflicts. Data can be queried by device.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.DistributedKVStore |
 | SINGLE_VERSION       | Single KV store.<br>The single KV store does not differentiate data by device. If entries with the same key are modified on different devices, the value will be overwritten.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core |
 
 ## SecurityLevel
@@ -137,11 +137,11 @@ Enumerates the KV store security levels.
 **System capability**: SystemCapability.DistributedDataManager.KVStore.Core
 
 | Name       | Description                                                        |
-| ---: | ------------------------------------------------------------ |
-|   S1 | Low security level. Disclosure, tampering, corruption, or loss of the data may cause minor impact on an individual or group.<br>Examples: gender and nationality information, and user application records |
-|   S2 | Medium security level. Disclosure, tampering, corruption, or loss of the data may cause major impact on an individual or group.<br>Examples: mailing addresses and nicknames of individuals |
-|   S3 | High security level. Disclosure, tampering, corruption, or loss of the data may cause critical impact on an individual or group.<br>Examples: real-time precise positioning information and movement trajectory |
-|   S4 | Critical security level. Disclosure, tampering, corruption, or loss of the data may cause significant adverse impact on an individual or group.<br>Examples: political opinions, religious and philosophical belief, trade union membership, genetic data, biological information, health and sexual life status, sexual orientation, device authentication, and personal credit card information |
+| -------:   | ------------------------------------------------------------ |
+| S1         | Low security level. Disclosure, tampering, corruption, or loss of the data may cause minor impact on an individual or group.<br>Examples: gender and nationality information, and user application records|
+| S2         | Medium security level. Disclosure, tampering, corruption, or loss of the data may cause major impact on an individual or group.<br>Examples: mailing addresses and nicknames of individuals|
+| S3         | High security level. Disclosure, tampering, corruption, or loss of the data may cause critical impact on an individual or group.<br>Examples: real-time precise positioning information and movement trajectory |
+| S4         | Critical security level. Disclosure, tampering, corruption, or loss of the data may cause significant adverse impact on an individual or group.<br>Examples: political opinions, religious and philosophical belief, trade union membership, genetic data, biological information, health and sexual life status, sexual orientation, device authentication, and personal credit card information|
 
 ## Options
 
@@ -149,13 +149,13 @@ Provides KV store configuration.
 
 | Name         | Type                       | Mandatory| Description                                                        |
 | --------------- | -------------- | ---- | -------------------------|
-| createIfMissing | boolean                         | No | Whether to create a KV store if no database file exists. By default, a KV store is created.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
-| encrypt         | boolean                         | No  | Whether to encrypt the KV store. By default, KV stores are not encrypted.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core |
-| backup          | boolean                         | No  | Whether to back up database files. By default, database files are backed up. <br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
-| autoSync        | boolean                         | No  | Whether to automatically synchronize the KV store data. The value **true** means to automatically synchronize the KV store data; the value **false** (default) means the opposite.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core<br>**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC |
-| kvStoreType     | [KVStoreType](#kvstoretype)     | No  | Type of the KV store to create. By default, a device KV store is created.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core |
-| securityLevel   | [SecurityLevel](#securitylevel) | Yes  |Security level of the KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
-| schema          | [Schema](#schema)               | No  | Schema used to define the values stored in the KV store. By default, **schema** is not used.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.DistributedKVStore|
+| createIfMissing | boolean                         | No | Whether to create a KV store if the database file does not exist. The default value is **true**, which means to create a KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
+| encrypt         | boolean                         | No  | Whether to encrypt the KV store. The default value is **false**, which means the KV store is not encrypted.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
+| backup          | boolean                         | No  | Whether to back up the KV store. The default value is **true**, which means to back up the KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
+| autoSync        | boolean                         | No  | Whether to automatically synchronize database files. The default value is **false**, which means the database files are manually synchronized.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core<br>**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC|
+| kvStoreType     | [KVStoreType](#kvstoretype)     | No  | Type of the KV store to create. The default value is **DEVICE_COLLABORATION**, which indicates a device KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
+| securityLevel   | [SecurityLevel](#securitylevel) | Yes  | Security level of the KV store.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.Core|
+| schema          | [Schema](#schema)               | No  | Schema used to define the values stored in the KV store. The default value is **undefined**, which means no schema is used.<br>**System capability**: SystemCapability.DistributedDataManager.KVStore.DistributedKVStore|
 
 ## Schema
 
@@ -166,7 +166,7 @@ Defines the schema of a KV store. You can create a **Schema** object and place i
 | Name   | Type                   | Readable| Writable| Description                      |
 | ------- | ----------------------- | ---- | ---- | -------------------------- |
 | root    | [FieldNode](#fieldnode) | Yes  | Yes  | JSON root object.          |
-| indexes | Array\<string>          | Yes  | Yes  | Array of strings in JSON format. |
+| indexes | Array\<string>          | Yes  | Yes  | String array in JSON format.|
 | mode    | number                  | Yes  | Yes  | Schema mode.        |
 | skip    | number                  | Yes  | Yes  | Size of a skip of the schema.        |
 
@@ -444,7 +444,7 @@ const options = {
     backup: false,
     autoSync: true,
     kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
-    schema: '',
+    schema: undefined,
     securityLevel: distributedKVStore.SecurityLevel.S2,
 }
 try {
@@ -500,7 +500,7 @@ const options = {
     backup: false,
     autoSync: true,
     kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
-    schema: '',
+    schema: undefined,
     securityLevel: distributedKVStore.SecurityLevel.S2,
 }
 try {
@@ -555,7 +555,7 @@ const options = {
     backup: false,
     autoSync: true,
     kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
-    schema: '',
+    schema: undefined,
     securityLevel: distributedKVStore.SecurityLevel.S2,
 }
 try {
@@ -619,7 +619,7 @@ const options = {
     backup: false,
     autoSync: true,
     kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
-    schema: '',
+    schema: undefined,
     securityLevel: distributedKVStore.SecurityLevel.S2,
 }
 try {
@@ -645,7 +645,7 @@ try {
 
 getAllKVStoreId(appId: string, callback: AsyncCallback&lt;string[]&gt;): void
 
-Obtains IDs of all distributed KV stores that are created by [getKVStore](#getkvstore) and have not been deleted by [deleteKVStore](#deletekvstore). This API uses an asynchronous callback to return the result.
+Obtains the IDs of all distributed KV stores that are created by [getKVStore](#getkvstore) and have not been deleted by [deleteKVStore](#deletekvstore). This API uses an asynchronous callback to return the result.
 
 **System capability**: SystemCapability.DistributedDataManager.KVStore.Core
 
@@ -677,7 +677,7 @@ try {
 
 getAllKVStoreId(appId: string): Promise&lt;string[]&gt;
 
-Obtains IDs of all distributed KV stores that are created by [getKVStore](#getkvstore) and have not been deleted by [deleteKVStore](#deletekvstore). This API uses a promise to return the result.
+Obtains the IDs of all distributed KV stores that are created by [getKVStore](#getkvstore) and have not been deleted by [deleteKVStore](#deletekvstore). This API uses a promise to return the result.
 
 **System capability**: SystemCapability.DistributedDataManager.KVStore.Core
 
@@ -751,7 +751,7 @@ Unsubscribes from service status changes. The **deathCallback** parameter must b
 | Name       | Type            | Mandatory| Description                                                        |
 | ------------- | -------------------- | ---- | ------------------------------------------------------------ |
 | event         | string               | Yes  | Event to unsubscribe from. The value is **distributedDataServiceDie**, which indicates a service status change event.|
-| deathCallback | Callback&lt;void&gt; | No  | Callback for the service status change event. If this parameter is not specified, all deathCallback subscriptions will be canceled.                                         |
+| deathCallback | Callback&lt;void&gt; | No  | Callback for the service status change event. If this parameter is not specified, all subscriptions to the service status change event are canceled.                                         |
 
 **Example**
 
@@ -4562,7 +4562,7 @@ Synchronizes the KV store manually. For details about the synchronization modes
 | --------- | --------------------- | ---- | ---------------------------------------------- |
 | deviceIds | string[]              | Yes  | List of IDs of the devices in the same networking environment to be synchronized.|
 | mode      | [SyncMode](#syncmode) | Yes  | Synchronization mode.                                    |
-| delayMs   | number                | No  | Allowed synchronization delay time, in ms.    |
+| delayMs   | number                | No  | Allowed synchronization delay time, in ms. The default value is **0**.    |
 
 **Error codes**
 
@@ -4632,7 +4632,7 @@ Synchronizes the KV store manually. This API returns the result synchronously. F
 | deviceIds | string[]              | Yes  | List of IDs of the devices in the same networking environment to be synchronized.|
 | mode      | [SyncMode](#syncmode) | Yes  | Synchronization mode.                                    |
 | query     | [Query](#query)        | Yes  | **Query** object to match.                      |
-| delayMs   | number                | No  | Allowed synchronization delay time, in ms.    |
+| delayMs   | number                | No  | Allowed synchronization delay time, in ms. The default value is **0**.|
 
 **Error codes**
 
@@ -4769,7 +4769,7 @@ Unsubscribes from data changes.
 | Name  | Type                                                 | Mandatory| Description                                                    |
 | -------- | --------------------------------------------------------- | ---- | -------------------------------------------------------- |
 | event    | string                                                    | Yes  | Event to unsubscribe from. The value is **dataChange**, which indicates a data change event.|
-| listener | Callback&lt;[ChangeNotification](#changenotification)&gt; | No  | Callback for the data change event.                                              |
+| listener | Callback&lt;[ChangeNotification](#changenotification)&gt; | No  | Callback for the data change event. If the callback is not specified, all subscriptions to the data change event are canceled.|
 
 **Error codes**
 
@@ -4822,7 +4822,7 @@ Unsubscribes from synchronization complete events.
 | Name      | Type                                     | Mandatory| Description                                                      |
 | ------------ | --------------------------------------------- | ---- | ---------------------------------------------------------- |
 | event        | string                                        | Yes  | Event to unsubscribe from. The value is **syncComplete**, which indicates a synchronization complete event.|
-| syncCallback | Callback&lt;Array&lt;[string, number]&gt;&gt; | No  | Callback for the synchronization complete event.                |
+| syncCallback | Callback&lt;Array&lt;[string, number]&gt;&gt; | No  | Callback for the synchronization complete event. If the callback is not specified, all subscriptions to the synchronization complete event are canceled. |
 
 **Example**