diff --git a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/enums/Status.java b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/enums/Status.java
index 7bd7a00a74..479f38d725 100644
--- a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/enums/Status.java
+++ b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/enums/Status.java
@@ -168,6 +168,8 @@ public enum Status {
     DELETE_TENANT_BY_ID_FAIL_DEFINES(100143,"delete tenant by id fail, for there are {0} process definitions using it"),
     DELETE_TENANT_BY_ID_FAIL_USERS(100144,"delete tenant by id fail, for there are {0} users using it"),
 
+    DELETE_WORKER_GROUP_BY_ID_FAIL(100143,"delete worker group by id fail, for there are {0} process instances in executing using it"),
+
     UDF_FUNCTION_NOT_EXIST(20001, "UDF function not found"),
     UDF_FUNCTION_EXISTS(20002, "UDF function already exists"),
 //    RESOURCE_EMPTY(20003, "resource file is empty"),
diff --git a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/TenantService.java b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/TenantService.java
index 11ace50648..bdc4991953 100644
--- a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/TenantService.java
+++ b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/TenantService.java
@@ -290,17 +290,7 @@ public class TenantService extends BaseService{
   }
 
   private List<ProcessInstance> getProcessInstancesByTenant(Tenant tenant) {
-    int[] states = new int[]{
-            ExecutionStatus.SUBMITTED_SUCCESS.ordinal(),
-            ExecutionStatus.RUNNING_EXEUTION.ordinal(),
-            ExecutionStatus.READY_PAUSE.ordinal(),
-            ExecutionStatus.READY_STOP.ordinal(),
-            ExecutionStatus.NEED_FAULT_TOLERANCE.ordinal(),
-            ExecutionStatus.WAITTING_THREAD.ordinal(),
-            ExecutionStatus.WAITTING_DEPEND.ordinal()
-            };
-
-    return processInstanceMapper.queryByTenantIdAndStatus(tenant.getId(), states);
+    return processInstanceMapper.queryByTenantIdAndStatus(tenant.getId(), org.apache.dolphinscheduler.common.Constants.NOT_TERMINATED_STATES);
   }
 
   /**
diff --git a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/WorkerGroupService.java b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/WorkerGroupService.java
index 3b67e02c19..80725495c7 100644
--- a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/WorkerGroupService.java
+++ b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/WorkerGroupService.java
@@ -19,8 +19,12 @@ package org.apache.dolphinscheduler.api.service;
 import org.apache.dolphinscheduler.api.enums.Status;
 import org.apache.dolphinscheduler.api.utils.Constants;
 import org.apache.dolphinscheduler.api.utils.PageInfo;
+import org.apache.dolphinscheduler.common.enums.ExecutionStatus;
+import org.apache.dolphinscheduler.common.utils.CollectionUtils;
+import org.apache.dolphinscheduler.dao.entity.ProcessInstance;
 import org.apache.dolphinscheduler.dao.entity.User;
 import org.apache.dolphinscheduler.dao.entity.WorkerGroup;
+import org.apache.dolphinscheduler.dao.mapper.ProcessInstanceMapper;
 import org.apache.dolphinscheduler.dao.mapper.WorkerGroupMapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
@@ -43,6 +47,9 @@ public class WorkerGroupService extends BaseService {
     @Autowired
     WorkerGroupMapper workerGroupMapper;
 
+    @Autowired
+    ProcessInstanceMapper processInstanceMapper;
+
     /**
      * create or update a worker group
      * @param id
@@ -142,7 +149,13 @@ public class WorkerGroupService extends BaseService {
 
         Map<String, Object> result = new HashMap<>(5);
 
+        List<ProcessInstance> processInstances = processInstanceMapper.queryByWorkerGroupIdAndStatus(id, org.apache.dolphinscheduler.common.Constants.NOT_TERMINATED_STATES);
+        if(CollectionUtils.isNotEmpty(processInstances)){
+            putMsg(result, Status.DELETE_WORKER_GROUP_BY_ID_FAIL, processInstances.size());
+            return result;
+        }
         workerGroupMapper.deleteById(id);
+        processInstanceMapper.updateProcessInstanceByWorkerGroupId(id, org.apache.dolphinscheduler.common.Constants.DEFAULT_WORKER_ID);
         putMsg(result, Status.SUCCESS);
         return result;
     }
diff --git a/dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/Constants.java b/dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/Constants.java
index 5a1b901328..c0977c4a47 100644
--- a/dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/Constants.java
+++ b/dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/Constants.java
@@ -16,6 +16,7 @@
  */
 package org.apache.dolphinscheduler.common;
 
+import org.apache.dolphinscheduler.common.enums.ExecutionStatus;
 import org.apache.dolphinscheduler.common.utils.OSUtils;
 
 import java.util.regex.Pattern;
@@ -925,4 +926,13 @@ public final class Constants {
     public static final String FLINK_MAIN_CLASS = "-c";
 
 
+    public static final int[] NOT_TERMINATED_STATES = new int[]{
+            ExecutionStatus.SUBMITTED_SUCCESS.ordinal(),
+            ExecutionStatus.RUNNING_EXEUTION.ordinal(),
+            ExecutionStatus.READY_PAUSE.ordinal(),
+            ExecutionStatus.READY_STOP.ordinal(),
+            ExecutionStatus.NEED_FAULT_TOLERANCE.ordinal(),
+            ExecutionStatus.WAITTING_THREAD.ordinal(),
+            ExecutionStatus.WAITTING_DEPEND.ordinal()
+    };
 }
diff --git a/dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/mapper/ProcessInstanceMapper.java b/dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/mapper/ProcessInstanceMapper.java
index ae78b929b9..d288658b40 100644
--- a/dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/mapper/ProcessInstanceMapper.java
+++ b/dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/mapper/ProcessInstanceMapper.java
@@ -37,6 +37,9 @@ public interface ProcessInstanceMapper extends BaseMapper<ProcessInstance> {
     List<ProcessInstance> queryByTenantIdAndStatus(@Param("tenantId") int tenantId,
                                                @Param("states") int[] states);
 
+    List<ProcessInstance> queryByWorkerGroupIdAndStatus(@Param("workerGroupId") int workerGroupId,
+                                                   @Param("states") int[] states);
+
     IPage<ProcessInstance> queryProcessInstanceListPaging(Page<ProcessInstance> page,
                                                           @Param("projectId") int projectId,
                                                           @Param("processDefinitionId") Integer processDefinitionId,
@@ -55,6 +58,8 @@ public interface ProcessInstanceMapper extends BaseMapper<ProcessInstance> {
 
     int updateProcessInstanceByTenantId(@Param("originTenantId") int originTenantId, @Param("destTenantId") int destTenantId);
 
+    int updateProcessInstanceByWorkerGroupId(@Param("originWorkerGroupId") int originWorkerGroupId, @Param("destWorkerGroupId") int destWorkerGroupId);
+
     List<ExecuteStatusCount> countInstanceStateByUser(
             @Param("startTime") Date startTime,
             @Param("endTime") Date endTime,
diff --git a/dolphinscheduler-dao/src/main/resources/org/apache/dolphinscheduler/dao/mapper/ProcessInstanceMapper.xml b/dolphinscheduler-dao/src/main/resources/org/apache/dolphinscheduler/dao/mapper/ProcessInstanceMapper.xml
index cd05dc56e3..75dc448883 100644
--- a/dolphinscheduler-dao/src/main/resources/org/apache/dolphinscheduler/dao/mapper/ProcessInstanceMapper.xml
+++ b/dolphinscheduler-dao/src/main/resources/org/apache/dolphinscheduler/dao/mapper/ProcessInstanceMapper.xml
@@ -34,6 +34,20 @@
         order by id asc
     </select>
 
+    <select id="queryByWorkerGroupIdAndStatus" resultType="org.apache.dolphinscheduler.dao.entity.ProcessInstance">
+        select *
+        from t_ds_process_instance
+        where 1=1
+        <if test="workerGroupId != -1">
+            and worker_group_id =#{workerGroupId}
+        </if>
+        and state in
+        <foreach collection="states" item="i" open="(" close=")" separator=",">
+            #{i}
+        </foreach>
+        order by id asc
+    </select>
+
     <select id="queryProcessInstanceListPaging" resultType="org.apache.dolphinscheduler.dao.entity.ProcessInstance">
         select instance.*
         from t_ds_process_instance instance
@@ -81,6 +95,12 @@
         where tenant_id = #{originTenantId}
     </update>
 
+    <update id="updateProcessInstanceByWorkerGroupId">
+        update t_ds_process_instance
+        set worker_group_id = #{destWorkerGroupId}
+        where worker_group_id = #{originWorkerGroupId}
+    </update>
+
     <select id="countInstanceStateByUser" resultType="org.apache.dolphinscheduler.dao.entity.ExecuteStatusCount">
         select t.state, count(0) as count
         from t_ds_process_instance t