diff --git a/VERSION b/VERSION
index 9ec8136..f9a4b5f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.3.19
+0.3.20
diff --git a/src/UKafka/Apis/CreateUKafkaInstanceRequest.php b/src/UKafka/Apis/CreateUKafkaInstanceRequest.php
index 7ba38d1..e8dbc1b 100644
--- a/src/UKafka/Apis/CreateUKafkaInstanceRequest.php
+++ b/src/UKafka/Apis/CreateUKafkaInstanceRequest.php
@@ -26,8 +26,6 @@ public function __construct()
         $this->markRequired("Region");
         $this->markRequired("Zone");
         $this->markRequired("FrameworkVersion");
-        $this->markRequired("VPCId");
-        $this->markRequired("SubnetId");
         $this->markRequired("ChargeType");
         $this->markRequired("NodeType");
         $this->markRequired("DiskSize");
@@ -116,46 +114,6 @@ public function setFrameworkVersion($frameworkVersion)
         $this->set("FrameworkVersion", $frameworkVersion);
     }
 
-    /**
-     * VPCId: VPCID
-     *
-     * @return string|null
-     */
-    public function getVPCId()
-    {
-        return $this->get("VPCId");
-    }
-
-    /**
-     * VPCId: VPCID
-     *
-     * @param string $vpcId
-     */
-    public function setVPCId($vpcId)
-    {
-        $this->set("VPCId", $vpcId);
-    }
-
-    /**
-     * SubnetId: 子网 ID
-     *
-     * @return string|null
-     */
-    public function getSubnetId()
-    {
-        return $this->get("SubnetId");
-    }
-
-    /**
-     * SubnetId: 子网 ID
-     *
-     * @param string $subnetId
-     */
-    public function setSubnetId($subnetId)
-    {
-        $this->set("SubnetId", $subnetId);
-    }
-
     /**
      * ChargeType: 付费方式
      *
@@ -236,6 +194,46 @@ public function setInstanceName($instanceName)
         $this->set("InstanceName", $instanceName);
     }
 
+    /**
+     * VPCId: VPCID，不填时为默认VPCID
+     *
+     * @return string|null
+     */
+    public function getVPCId()
+    {
+        return $this->get("VPCId");
+    }
+
+    /**
+     * VPCId: VPCID，不填时为默认VPCID
+     *
+     * @param string $vpcId
+     */
+    public function setVPCId($vpcId)
+    {
+        $this->set("VPCId", $vpcId);
+    }
+
+    /**
+     * SubnetId: 子网 ID，不填时为默认子网 ID
+     *
+     * @return string|null
+     */
+    public function getSubnetId()
+    {
+        return $this->get("SubnetId");
+    }
+
+    /**
+     * SubnetId: 子网 ID，不填时为默认子网 ID
+     *
+     * @param string $subnetId
+     */
+    public function setSubnetId($subnetId)
+    {
+        $this->set("SubnetId", $subnetId);
+    }
+
     /**
      * BusinessId: 业务组，默认Default
      *
diff --git a/src/UKafka/UKafkaClient.php b/src/UKafka/UKafkaClient.php
index 910aed8..392f246 100644
--- a/src/UKafka/UKafkaClient.php
+++ b/src/UKafka/UKafkaClient.php
@@ -93,12 +93,12 @@ public function addUKafkaInstanceNode(AddUKafkaInstanceNodeRequest $request = nu
      *     "Zone" => (string) 可用区。参见 [可用区列表](https://docs.ucloud.cn/api/summary/regionlist)
      *     "ProjectId" => (string) 项目ID。不填写为默认项目，子帐号必须填写。 请参考[GetProjectList接口](https://docs.ucloud.cn/api/summary/get_project_list)
      *     "FrameworkVersion" => (string) kafka版本，支持的版本可通过ListUKafkaFrameworkVersion 接口返回字段的FrameworkVersions获取
-     *     "VPCId" => (string) VPCID
-     *     "SubnetId" => (string) 子网 ID
      *     "ChargeType" => (string) 付费方式
      *     "NodeType" => (string) 机型，支持的机型可通过GetUKafkaNodeType 接口返回的InstanceTypeSet[].InstanceTypeName
      *     "DiskSize" => (integer) 数据盘大小。支持范围根据GetUKafkaNodeType 接口返回的InstanceTypeSet[].MaxDiskSize 和MinDiskSize获取
      *     "InstanceName" => (string) 实例名，可自定义。只能包含中英文、数字以及- _ .
+     *     "VPCId" => (string) VPCID，不填时为默认VPCID
+     *     "SubnetId" => (string) 子网 ID，不填时为默认子网 ID
      *     "BusinessId" => (string) 业务组，默认Default
      *     "Quantity" => (string) 实例数量，默认 1
      *     "NodeCount" => (integer) 实例节点数量。默认 3 节点