diff --git a/api-ref/source/apis_recommended/backup_management/querying_backups.rst b/api-ref/source/apis_recommended/backup_management/querying_backups.rst
index 39d3658..1934497 100644
--- a/api-ref/source/apis_recommended/backup_management/querying_backups.rst
+++ b/api-ref/source/apis_recommended/backup_management/querying_backups.rst
@@ -126,20 +126,6 @@ Response Parameters
    +-----------------------+-------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
    | instance_id           | String                                                                  | Instance ID.                                                                                                                                                               |
    +-----------------------+-------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-   | backup_level          | String                                                                  | Backup level. This parameter is returned when the level-1 backup function is enabled.                                                                                      |
-   |                       |                                                                         |                                                                                                                                                                            |
-   |                       |                                                                         | Valid value:                                                                                                                                                               |
-   |                       |                                                                         |                                                                                                                                                                            |
-   |                       |                                                                         | -  **0**: Backup being created or creation failed                                                                                                                          |
-   |                       |                                                                         | -  **1**: level-1 backup                                                                                                                                                   |
-   |                       |                                                                         | -  **2**: level-2 backup                                                                                                                                                   |
-   |                       |                                                                         |                                                                                                                                                                            |
-   |                       |                                                                         | Valid value:                                                                                                                                                               |
-   |                       |                                                                         |                                                                                                                                                                            |
-   |                       |                                                                         | -  0                                                                                                                                                                       |
-   |                       |                                                                         | -  1                                                                                                                                                                       |
-   |                       |                                                                         | -  2                                                                                                                                                                       |
-   +-----------------------+-------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
    | description           | String                                                                  | Description of the backup file.                                                                                                                                            |
    +-----------------------+-------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 
@@ -209,8 +195,8 @@ Success.
          "type" : "gaussdb-mysql",
          "version" : "8.0"
        },
-       "instance_id" : "43e4feaab48f11e89039fa163ebaa7e4br01",
-       "backup_level" : "2"
+       "instance_id" : "43e4feaab48f11e89039fa163ebaa7e4br01"
+
      } ],
      "total_count" : 1
    }
diff --git a/api-ref/source/apis_unavailable_soon/backup_management/querying_an_automated_backup_policy.rst b/api-ref/source/apis_unavailable_soon/backup_management/querying_an_automated_backup_policy.rst
index bb64c8d..cb95bf6 100644
--- a/api-ref/source/apis_unavailable_soon/backup_management/querying_an_automated_backup_policy.rst
+++ b/api-ref/source/apis_unavailable_soon/backup_management/querying_an_automated_backup_policy.rst
@@ -70,17 +70,15 @@ Response Parameters
 
 .. table:: **Table 4** BackupPolicy
 
-   +-----------------------------+---------+---------------------------------------------------------------------------------------------------+
-   | Parameter                   | Type    | Description                                                                                       |
-   +=============================+=========+===================================================================================================+
-   | keep_days                   | Integer | Backup retention days.                                                                            |
-   +-----------------------------+---------+---------------------------------------------------------------------------------------------------+
-   | start_time                  | String  | Backup time window. Automated backups will be triggered during the backup time window.            |
-   +-----------------------------+---------+---------------------------------------------------------------------------------------------------+
-   | period                      | String  | Backup cycle configuration. Data will be automatically backed up on the selected days every week. |
-   +-----------------------------+---------+---------------------------------------------------------------------------------------------------+
-   | retention_num_backup_level1 | Integer | Number of retained level-1 backups. This parameter is returned when level-1 backup is enabled.    |
-   +-----------------------------+---------+---------------------------------------------------------------------------------------------------+
+   +------------+---------+---------------------------------------------------------------------------------------------------+
+   | Parameter  | Type    | Description                                                                                       |
+   +============+=========+===================================================================================================+
+   | keep_days  | Integer | Backup retention days.                                                                            |
+   +------------+---------+---------------------------------------------------------------------------------------------------+
+   | start_time | String  | Backup time window. Automated backups will be triggered during the backup time window.            |
+   +------------+---------+---------------------------------------------------------------------------------------------------+
+   | period     | String  | Backup cycle configuration. Data will be automatically backed up on the selected days every week. |
+   +------------+---------+---------------------------------------------------------------------------------------------------+
 
 **Status code: 400**
 
@@ -124,8 +122,8 @@ Success.
      "backup_policy" : {
        "keep_days" : "7,",
        "start_time" : "19:00-20:00",
-       "period" : "1,2",
-       "retention_num_backup_level1" : 1
+       "period" : "1,2"
+
      }
    }
 
diff --git a/api-ref/source/apis_unavailable_soon/backup_management/querying_backups.rst b/api-ref/source/apis_unavailable_soon/backup_management/querying_backups.rst
index 95c0b76..9815403 100644
--- a/api-ref/source/apis_unavailable_soon/backup_management/querying_backups.rst
+++ b/api-ref/source/apis_unavailable_soon/backup_management/querying_backups.rst
@@ -126,12 +126,6 @@ Response Parameters
    +-----------------------+------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------+
    | instance_id           | String                                                                                               | DB instance ID.                                                                                                    |
    +-----------------------+------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------+
-   | backup_level          | String                                                                                               | Backup level. This parameter is returned when the level-1 backup function is enabled. Value:                       |
-   |                       |                                                                                                      |                                                                                                                    |
-   |                       |                                                                                                      | -  **1**: level-1 backup                                                                                           |
-   |                       |                                                                                                      | -  **2**: level-2 backup                                                                                           |
-   |                       |                                                                                                      | -  **0**: Backup being created or creation failed                                                                  |
-   +-----------------------+------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------+
    | description           | String                                                                                               | Description of the backup file.                                                                                    |
    +-----------------------+------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------+
 
@@ -199,8 +193,8 @@ Success.
          "type" : "gaussdb-mysql",
          "version" : "8.0"
        },
-       "instance_id" : "43e4feaab48f11e89039fa163ebaa7e4br01",
-       "backup_level" : "2"
+       "instance_id" : "43e4feaab48f11e89039fa163ebaa7e4br01"
+
      } ],
      "total_count" : 1
    }
diff --git a/api-ref/source/change_history.rst b/api-ref/source/change_history.rst
index b5ea5b0..a5da4ab 100644
--- a/api-ref/source/change_history.rst
+++ b/api-ref/source/change_history.rst
@@ -5,24 +5,29 @@
 Change History
 ==============
 
-+-----------------------------------+------------------------------------------------------------------------------------------------------------+
-| Released On                       | Description                                                                                                |
-+===================================+============================================================================================================+
-| 2022-11-30                        | Modified the following content:                                                                            |
-|                                   |                                                                                                            |
-|                                   | -  Added :ref:`Querying Database Proxy Specifications <showgaussmysqlproxyflavors>`.                       |
-|                                   | -  Added :ref:`Enabling Database Proxy <creategaussmysqlproxy>`.                                           |
-|                                   | -  Added :ref:`Disabling Database Proxy <deletegaussmysqlproxy>`.                                          |
-|                                   | -  Added :ref:`Adding Database Proxy Nodes <expandgaussmysqlproxy>`.                                       |
-|                                   | -  Added :ref:`Querying Database Proxy Instances <showgaussmysqlproxylist>`.                               |
-|                                   | -  Added :ref:`Changing Specifications of a Database Proxy Instance <changegaussmysqlproxyspecification>`. |
-|                                   | -  Added :ref:`Assigning Read Weights <setgaussmysqlproxyweight>`.                                         |
-+-----------------------------------+------------------------------------------------------------------------------------------------------------+
-| 2020-12-09                        | Modified the following content:                                                                            |
-|                                   |                                                                                                            |
-|                                   | Optimized the content for API usage.                                                                       |
-|                                   |                                                                                                            |
-|                                   | Modified the **spec_code description** in :ref:`Querying Database Specifications <gaussdb_11_0002>`.       |
-+-----------------------------------+------------------------------------------------------------------------------------------------------------+
-| 2020-05-30                        | This issue is the first official release.                                                                  |
-+-----------------------------------+------------------------------------------------------------------------------------------------------------+
++-----------------------------------+---------------------------------------------------------------------------------------------------------------------------+
+| Released On                       | Description                                                                                                               |
++===================================+===========================================================================================================================+
+| 2023-04-06                        | Modified the following content:                                                                                           |
+|                                   |                                                                                                                           |
+|                                   | -  Deleted the parameter **backup_level** in :ref:`Querying Backups <gaussdb_06_0004>`.                                   |
+|                                   | -  Deleted the parameter **retention_num_backup_level1** in :ref:`Querying an Automated Backup Policy <gaussdb_06_0005>`. |
++-----------------------------------+---------------------------------------------------------------------------------------------------------------------------+
+| 2022-11-30                        | Modified the following content:                                                                                           |
+|                                   |                                                                                                                           |
+|                                   | -  Added :ref:`Querying Database Proxy Specifications <showgaussmysqlproxyflavors>`.                                      |
+|                                   | -  Added :ref:`Enabling Database Proxy <creategaussmysqlproxy>`.                                                          |
+|                                   | -  Added :ref:`Disabling Database Proxy <deletegaussmysqlproxy>`.                                                         |
+|                                   | -  Added :ref:`Adding Database Proxy Nodes <expandgaussmysqlproxy>`.                                                      |
+|                                   | -  Added :ref:`Querying Database Proxy Instances <showgaussmysqlproxylist>`.                                              |
+|                                   | -  Added :ref:`Changing Specifications of a Database Proxy Instance <changegaussmysqlproxyspecification>`.                |
+|                                   | -  Added :ref:`Assigning Read Weights <setgaussmysqlproxyweight>`.                                                        |
++-----------------------------------+---------------------------------------------------------------------------------------------------------------------------+
+| 2020-12-09                        | Modified the following content:                                                                                           |
+|                                   |                                                                                                                           |
+|                                   | Optimized the content for API usage.                                                                                      |
+|                                   |                                                                                                                           |
+|                                   | Modified the **spec_code description** in :ref:`Querying Database Specifications <gaussdb_11_0002>`.                      |
++-----------------------------------+---------------------------------------------------------------------------------------------------------------------------+
+| 2020-05-30                        | This issue is the first official release.                                                                                 |
++-----------------------------------+---------------------------------------------------------------------------------------------------------------------------+