diff --git a/README.md b/README.md
index 6f0df1e4..a1537637 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 
 NebulaGraph Spark Connector 2.0/3.0 only supports NebulaGraph 2.x/3.x. If you are using NebulaGraph v1.x, please use [NebulaGraph Spark Connector v1.0](https://github.com/vesoft-inc/nebula-java/tree/v1.0/tools/nebula-spark) .
 
-NebulaGraph Spark Connector support spark 2.2 and 2.4.
+NebulaGraph Spark Connector support spark 2.2, 2.4 and 3.0.
 
 ## How to Compile
 
@@ -13,13 +13,18 @@ NebulaGraph Spark Connector support spark 2.2 and 2.4.
 
     ```bash
     $ git clone https://github.com/vesoft-inc/nebula-spark-connector.git
-    $ cd nebula-spark-connector/nebula-spark-connector
-    $ mvn clean package -Dmaven.test.skip=true -Dgpg.skip -Dmaven.javadoc.skip=true
+    $ cd nebula-spark-connector
+    $ mvn clean package -Dmaven.test.skip=true -Dgpg.skip -Dmaven.javadoc.skip=true -pl nebula-spark-connector -am -Pscala-2.11 -Pspark-2.4
     ```
    if you want to use connector for spark 2.2.x, use the command:
    ```
-   $ cd nebula-spark-connector/nebula-spark-connector_2.2
-   $ mvn clean package -Dmaven.test.skip=true -Dgpg.skip -Dmaven.javadoc.skip=true
+   $ cd nebula-spark-connector
+   $ mvn clean package -Dmaven.test.skip=true -Dgpg.skip -Dmaven.javadoc.skip=true -pl nebula-spark-connector_2.2 -am -Pscala-2.11 -Pspark-2.2
+   ```
+   if you want to use connector for spark 3.x, use the command:
+   ```
+   $ cd nebula-spark-connector
+   $ mvn clean package -Dmaven.test.skip=true -Dgpg.skip -Dmaven.javadoc.skip=true -pl nebula-spark-connector_3.0 -am -Pscala-2.12 -Pspark-3.0
    ```
 
     After the packaging, you can see the newly generated nebula-spark-connector-3.0-SNAPSHOT.jar under the nebula-spark-connector/nebula-spark-connector/target/ directory.
diff --git a/README_CN.md b/README_CN.md
index d3db0938..7dc9247d 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -4,20 +4,29 @@
 
 Nebula Spark Connector 2.0/3.0 仅支持 Nebula Graph 2.x/3.x。如果您正在使用 Nebula Graph v1.x，请使用 [Nebula Spark Connector v1.0](https://github.com/vesoft-inc/nebula-java/tree/v1.0/tools)。
 
-Nebula Spark Connector 支持 Spark 2.2 和 2.4.
+Nebula Spark Connector 支持 Spark 2.2， 2.4 和 3.x.
 ## 如何编译
 
 1. 编译打包 Nebula Spark Connector。
 
-    ```bash
-    $ git clone https://github.com/vesoft-inc/nebula-spark-connector.git
-    $ cd nebula-spark-connector/nebula-spark-connector
-    $ mvn clean package -Dmaven.test.skip=true -Dgpg.skip -Dmaven.javadoc.skip=true
-    ```
+        ```bash
+        $ git clone https://github.com/vesoft-inc/nebula-spark-connector.git
+        $ cd nebula-spark-connector
+        $ mvn clean package -Dmaven.test.skip=true -Dgpg.skip -Dmaven.javadoc.skip=true -pl nebula-spark-connector -am -Pscala-2.11 -Pspark-2.4
+        ```
+       若想在spark2.2环境中使用connector，请使用如下命令编译：
+       ```
+       $ cd nebula-spark-connector
+       $ mvn clean package -Dmaven.test.skip=true -Dgpg.skip -Dmaven.javadoc.skip=true -pl nebula-spark-connector_2.2 -am -Pscala-2.11 -Pspark-2.2
+       ```
+       若想在spark3.0环境中使用connector，请使用如下命令编译：
+       ```
+       $ cd nebula-spark-connector
+       $ mvn clean package -Dmaven.test.skip=true -Dgpg.skip -Dmaven.javadoc.skip=true -pl nebula-spark-connector_3.0 -am -Pscala-2.12 -Pspark-3.0
+       ```
 
     编译打包完成后，可以在 nebula-spark-connector/nebula-spark-connector/target/ 目录下看到 nebula-spark-connector-3.0-SNAPSHOT.jar 文件。
 
-    若在 spark 2.2 环境中使用 Nebula Spark Connector，请在 nebula-spark-connector_2.2 目录下进行编译。
 ## 特性
 
 * 提供了更多连接配置项，如超时时间、连接重试次数、执行重试次数
diff --git a/example/src/main/scala/com/vesoft/nebula/examples/connector/NebulaSparkReaderExample.scala b/example/src/main/scala/com/vesoft/nebula/examples/connector/NebulaSparkReaderExample.scala
index 3d5a07d2..cdb67a4e 100644
--- a/example/src/main/scala/com/vesoft/nebula/examples/connector/NebulaSparkReaderExample.scala
+++ b/example/src/main/scala/com/vesoft/nebula/examples/connector/NebulaSparkReaderExample.scala
@@ -43,7 +43,7 @@ object NebulaSparkReaderExample {
     val config =
       NebulaConnectionConfig
         .builder()
-        .withMetaAddress("192.168.8.171:9559")
+        .withMetaAddress("127.0.0.1:9559")
         .withConenctionRetry(2)
         .build()
     val nebulaReadVertexConfig: ReadNebulaConfig = ReadNebulaConfig
@@ -65,7 +65,7 @@ object NebulaSparkReaderExample {
     val config =
       NebulaConnectionConfig
         .builder()
-        .withMetaAddress("192.168.8.171:9559")
+        .withMetaAddress("127.0.0.1:9559")
         .withTimeout(6000)
         .withConenctionRetry(2)
         .build()
diff --git a/example/src/main/scala/com/vesoft/nebula/examples/connector/NebulaSparkWriterExample.scala b/example/src/main/scala/com/vesoft/nebula/examples/connector/NebulaSparkWriterExample.scala
index ccde7fdf..031a0c21 100644
--- a/example/src/main/scala/com/vesoft/nebula/examples/connector/NebulaSparkWriterExample.scala
+++ b/example/src/main/scala/com/vesoft/nebula/examples/connector/NebulaSparkWriterExample.scala
@@ -100,8 +100,8 @@ object NebulaSparkWriterExample {
     val config =
       NebulaConnectionConfig
         .builder()
-        .withMetaAddress("192.168.8.171:9559")
-        .withGraphAddress("192.168.8.171:9669")
+        .withMetaAddress("127.0.0.1:9559")
+        .withGraphAddress("127.0.0.1:9669")
         .withConenctionRetry(2)
         .build()
     val nebulaWriteVertexConfig: WriteNebulaVertexConfig = WriteNebulaVertexConfig