diff --git a/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/SnowFlakeUtilsTest.java b/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/SnowFlakeUtilsTest.java
index bdf7096ba..e72e87f2c 100644
--- a/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/SnowFlakeUtilsTest.java
+++ b/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/SnowFlakeUtilsTest.java
@@ -17,18 +17,19 @@
 
 package org.apache.dolphinscheduler.common.utils;
 
+import java.util.HashSet;
+
+import org.junit.Assert;
 import org.junit.Test;
 
 public class SnowFlakeUtilsTest {
     @Test
-    public void testNextId() {
-        try {
-            for (int i = 0; i < 100; i++) {
-                Thread.sleep(1);
-                System.out.println(SnowFlakeUtils.getInstance().nextId());
-            }
-        } catch (Exception e) {
-            e.printStackTrace();
+    public void testNoGenerateDuplicateId() throws SnowFlakeUtils.SnowFlakeException {
+        HashSet<Long> existsSnowFlakeId = new HashSet<>();
+        for (int i = 0; i < 100; i++) {
+            Long currentId = SnowFlakeUtils.getInstance().nextId();
+            Assert.assertFalse(existsSnowFlakeId.contains(currentId));
+            existsSnowFlakeId.add(currentId);
         }
     }
 }
diff --git a/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/StringTest.java b/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/StringTest.java
index b14be21e6..0f8055d6b 100644
--- a/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/StringTest.java
+++ b/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/StringTest.java
@@ -47,7 +47,6 @@ public class StringTest {
                 }
             }
             double during = (System.currentTimeMillis() - start) / 1000.0;
-            System.out.println(during);
             Assert.assertEquals("1_0000000000_0000000001", origin);
         }
     }
diff --git a/dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/upgrade/UpgradeDao.java b/dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/upgrade/UpgradeDao.java
index 9325f17c3..d232cf982 100644
--- a/dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/upgrade/UpgradeDao.java
+++ b/dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/upgrade/UpgradeDao.java
@@ -671,7 +671,6 @@ public abstract class UpgradeDao {
                 taskDefinitionLog.setName(name);
                 taskDefinitionLog.setWorkerGroup(task.get("workerGroup").asText());
                 long taskCode = SnowFlakeUtils.getInstance().nextId();
-                // System.out.println(taskCode);
                 taskDefinitionLog.setCode(taskCode);
                 taskDefinitionLog.setVersion(Constants.VERSION_FIRST);
                 taskDefinitionLog.setProjectCode(processDefinition.getProjectCode());
diff --git a/dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-api/src/test/java/org/apache/dolphinscheduler/plugin/datasource/api/datasource/hive/HiveDatasourceProcessorTest.java b/dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-api/src/test/java/org/apache/dolphinscheduler/plugin/datasource/api/datasource/hive/HiveDatasourceProcessorTest.java
index 89ca40966..84e8fd889 100644
--- a/dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-api/src/test/java/org/apache/dolphinscheduler/plugin/datasource/api/datasource/hive/HiveDatasourceProcessorTest.java
+++ b/dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-api/src/test/java/org/apache/dolphinscheduler/plugin/datasource/api/datasource/hive/HiveDatasourceProcessorTest.java
@@ -59,7 +59,6 @@ public class HiveDatasourceProcessorTest {
         PowerMockito.when(CommonUtils.getKerberosStartupState()).thenReturn(false);
         HiveConnectionParam connectionParams = (HiveConnectionParam) hiveDatasourceProcessor
                 .createConnectionParams(hiveDataSourceParamDTO);
-        System.out.println(JSONUtils.toJsonString(connectionParams));
         Assert.assertNotNull(connectionParams);
         Assert.assertEquals("jdbc:hive2://localhost1:5142,localhost2:5142", connectionParams.getAddress());
     }
diff --git a/dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-api/src/test/java/org/apache/dolphinscheduler/plugin/datasource/api/datasource/mysql/MysqlDatasourceProcessorTest.java b/dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-api/src/test/java/org/apache/dolphinscheduler/plugin/datasource/api/datasource/mysql/MysqlDatasourceProcessorTest.java
index eef74f4bc..beeda1e9d 100644
--- a/dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-api/src/test/java/org/apache/dolphinscheduler/plugin/datasource/api/datasource/mysql/MysqlDatasourceProcessorTest.java
+++ b/dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-api/src/test/java/org/apache/dolphinscheduler/plugin/datasource/api/datasource/mysql/MysqlDatasourceProcessorTest.java
@@ -58,7 +58,6 @@ public class MysqlDatasourceProcessorTest {
         PowerMockito.when(PasswordUtils.encodePassword(Mockito.anyString())).thenReturn("test");
         MysqlConnectionParam connectionParams = (MysqlConnectionParam) mysqlDatasourceProcessor
                 .createConnectionParams(mysqlDatasourceParamDTO);
-        System.out.println(JSONUtils.toJsonString(connectionParams));
         Assert.assertEquals("jdbc:mysql://localhost:3306", connectionParams.getAddress());
         Assert.assertEquals("jdbc:mysql://localhost:3306/default", connectionParams.getJdbcUrl());
     }
diff --git a/dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/worker/registry/WorkerRegistryClientTest.java b/dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/worker/registry/WorkerRegistryClientTest.java
index bbc131dc9..d12cefb6f 100644
--- a/dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/worker/registry/WorkerRegistryClientTest.java
+++ b/dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/worker/registry/WorkerRegistryClientTest.java
@@ -81,7 +81,6 @@ public class WorkerRegistryClientTest {
     @Test
     public void testRegistry() {
         //workerRegistryClient.initWorkRegistry();
-        // System.out.println(this.workerGroups.iterator());
         //Set<String> workerGroups = Sets.newHashSet("127.0.0.1");
         //workerRegistryClient.registry();
        // workerRegistryClient.handleDeadServer();
diff --git a/dolphinscheduler-service/src/test/java/org/apache/dolphinscheduler/service/queue/TaskPriorityQueueImplTest.java b/dolphinscheduler-service/src/test/java/org/apache/dolphinscheduler/service/queue/TaskPriorityQueueImplTest.java
index d90011b84..3888d3d93 100644
--- a/dolphinscheduler-service/src/test/java/org/apache/dolphinscheduler/service/queue/TaskPriorityQueueImplTest.java
+++ b/dolphinscheduler-service/src/test/java/org/apache/dolphinscheduler/service/queue/TaskPriorityQueueImplTest.java
@@ -103,9 +103,7 @@ public class TaskPriorityQueueImplTest {
         queue.poll(1000, TimeUnit.MILLISECONDS);
         queue.poll(1000, TimeUnit.MILLISECONDS);
         Assert.assertTrue(queue.size() == 0);
-        System.out.println(System.currentTimeMillis());
         queue.poll(1000, TimeUnit.MILLISECONDS);
-        System.out.println(System.currentTimeMillis());
     }
 
     @Test
diff --git a/style/checkstyle.xml b/style/checkstyle.xml
index 48340ed9e..08bb05b10 100644
--- a/style/checkstyle.xml
+++ b/style/checkstyle.xml
@@ -34,6 +34,11 @@
         <property name="ignorePattern" value="^ *\* *[^ ]+$"/>
     </module>
 
+    <module name="RegexpSingleline">
+        <property name="format" value="System\.out\.println"/>
+        <property name="message" value="Prohibit invoking System.out.println in source code !"/>
+    </module>
+
     <module name="TreeWalker">
         <module name="OuterTypeFilename">
             <property name="severity" value="error"/>