diff --git a/dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/model/TaskNode.java b/dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/model/TaskNode.java
index cd3e573b16..e410b99ac0 100644
--- a/dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/model/TaskNode.java
+++ b/dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/model/TaskNode.java
@@ -204,7 +204,6 @@ public class TaskNode {
 
   public void setDepList(List<String> depList) throws JsonProcessingException {
     this.depList = depList;
-    this.preTasks = JSONUtils.toJsonString(depList);
   }
 
   public String getLoc() {
diff --git a/dolphinscheduler-dao/src/test/java/org/apache/dolphinscheduler/dao/utils/DagHelperTest.java b/dolphinscheduler-dao/src/test/java/org/apache/dolphinscheduler/dao/utils/DagHelperTest.java
index 88e71c4891..3e93ce792d 100644
--- a/dolphinscheduler-dao/src/test/java/org/apache/dolphinscheduler/dao/utils/DagHelperTest.java
+++ b/dolphinscheduler-dao/src/test/java/org/apache/dolphinscheduler/dao/utils/DagHelperTest.java
@@ -17,8 +17,6 @@
 
 package org.apache.dolphinscheduler.dao.utils;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-
 import org.apache.dolphinscheduler.common.Constants;
 import org.apache.dolphinscheduler.common.enums.ExecutionStatus;
 import org.apache.dolphinscheduler.common.enums.TaskDependType;
@@ -26,19 +24,21 @@ import org.apache.dolphinscheduler.common.graph.DAG;
 import org.apache.dolphinscheduler.common.model.TaskNode;
 import org.apache.dolphinscheduler.common.model.TaskNodeRelation;
 import org.apache.dolphinscheduler.common.process.ProcessDag;
-import org.apache.dolphinscheduler.common.utils.*;
+import org.apache.dolphinscheduler.common.utils.JSONUtils;
 import org.apache.dolphinscheduler.dao.entity.ProcessData;
 import org.apache.dolphinscheduler.dao.entity.TaskInstance;
 
-import org.junit.Assert;
-import org.junit.Test;
-
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
 
 /**
  * dag helper test
@@ -50,7 +50,7 @@ public class DagHelperTest {
      * @throws JsonProcessingException if error throws JsonProcessingException
      */
     @Test
-    public void testTaskNodeCanSubmit() throws JsonProcessingException {
+    public void testTaskNodeCanSubmit() throws IOException {
         //1->2->3->5->7
         //4->3->6
         DAG<String, TaskNode, TaskNodeRelation> dag = generateDag();
@@ -89,7 +89,7 @@ public class DagHelperTest {
      * test parse post node list
      */
     @Test
-    public void testParsePostNodeList() throws JsonProcessingException {
+    public void testParsePostNodeList() throws IOException {
         DAG<String, TaskNode, TaskNodeRelation> dag = generateDag();
         Map<String, TaskInstance> completeTaskList = new HashMap<>();
         Map<String, TaskNode> skipNodeList = new HashMap<>();
@@ -156,7 +156,7 @@ public class DagHelperTest {
      * @throws JsonProcessingException
      */
     @Test
-    public void testForbiddenPostNode() throws JsonProcessingException {
+    public void testForbiddenPostNode() throws IOException {
         DAG<String, TaskNode, TaskNodeRelation> dag = generateDag();
         Map<String, TaskInstance> completeTaskList = new HashMap<>();
         Map<String, TaskNode> skipNodeList = new HashMap<>();
@@ -194,7 +194,7 @@ public class DagHelperTest {
      * @throws JsonProcessingException
      */
     @Test
-    public void testConditionPostNode() throws JsonProcessingException {
+    public void testConditionPostNode() throws IOException {
         DAG<String, TaskNode, TaskNodeRelation> dag = generateDag();
         Map<String, TaskInstance> completeTaskList = new HashMap<>();
         Map<String, TaskNode> skipNodeList = new HashMap<>();
@@ -268,7 +268,7 @@ public class DagHelperTest {
      * @return dag
      * @throws JsonProcessingException if error throws JsonProcessingException
      */
-    private DAG<String, TaskNode, TaskNodeRelation> generateDag() throws JsonProcessingException {
+    private DAG<String, TaskNode, TaskNodeRelation> generateDag() throws IOException {
         List<TaskNode> taskNodeList = new ArrayList<>();
         TaskNode node1 = new TaskNode();
         node1.setId("1");
@@ -282,7 +282,7 @@ public class DagHelperTest {
         node2.setType("SHELL");
         List<String> dep2 = new ArrayList<>();
         dep2.add("1");
-        node2.setDepList(dep2);
+        node2.setPreTasks(JSONUtils.toJsonString(dep2));
         taskNodeList.add(node2);
 
 
@@ -299,7 +299,7 @@ public class DagHelperTest {
         List<String> dep3 = new ArrayList<>();
         dep3.add("2");
         dep3.add("4");
-        node3.setDepList(dep3);
+        node3.setPreTasks(JSONUtils.toJsonString(dep3));
         taskNodeList.add(node3);
 
         TaskNode node5 = new TaskNode();
@@ -309,7 +309,7 @@ public class DagHelperTest {
         List<String> dep5 = new ArrayList<>();
         dep5.add("3");
         dep5.add("8");
-        node5.setDepList(dep5);
+        node5.setPreTasks(JSONUtils.toJsonString(dep5));
         taskNodeList.add(node5);
 
         TaskNode node6 = new TaskNode();
@@ -318,7 +318,7 @@ public class DagHelperTest {
         node6.setType("SHELL");
         List<String> dep6 = new ArrayList<>();
         dep6.add("3");
-        node6.setDepList(dep6);
+        node6.setPreTasks(JSONUtils.toJsonString(dep6));
         taskNodeList.add(node6);
 
         TaskNode node7 = new TaskNode();
@@ -327,7 +327,7 @@ public class DagHelperTest {
         node7.setType("SHELL");
         List<String> dep7 = new ArrayList<>();
         dep7.add("5");
-        node7.setDepList(dep7);
+        node7.setPreTasks(JSONUtils.toJsonString(dep7));
         taskNodeList.add(node7);
 
         TaskNode node8 = new TaskNode();
@@ -336,7 +336,7 @@ public class DagHelperTest {
         node8.setType("SHELL");
         List<String> dep8 = new ArrayList<>();
         dep8.add("2");
-        node8.setDepList(dep8);
+        node8.setPreTasks(JSONUtils.toJsonString(dep8));
         taskNodeList.add(node8);
 
         List<String> startNodes = new ArrayList<>();