diff --git a/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/controller/TaskTaskController.java b/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/controller/TaskTaskController.java
index eb2629b..ed9fb8b 100644
--- a/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/controller/TaskTaskController.java
+++ b/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/controller/TaskTaskController.java
@@ -206,6 +206,22 @@ public class TaskTaskController extends JeecgController<TaskTask, ITaskTaskServi
         return Result.OK(taskTaskList);
     }
 
+    /**
+     * 更新部门经办人姓名
+     */
+    @AutoLog(value = "事项任务计划表-更新部门经办人姓名")
+    @Operation(summary = "事项任务计划表-更新部门经办人姓名")
+    @PostMapping(value = "/updateDeptHandlerName")
+    public Result<String> updateDeptHandlerName(@RequestBody Map<String, String> params) {
+        String processInstanceId = params.get("processInstanceId");
+        String deptHandlerName = params.get("deptHandlerName");
+        if (StringUtils.isBlank(processInstanceId) || StringUtils.isBlank(deptHandlerName)) {
+            return Result.error("processInstanceId 和 deptHandlerName 不能为空");
+        }
+        boolean success = taskTaskService.updateDeptHandlerName(processInstanceId, deptHandlerName);
+        return success ? Result.OK("更新成功") : Result.error("更新失败，未找到对应任务记录");
+    }
+
     /**
      * 导出excel
      *
diff --git a/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/service/ITaskTaskService.java b/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/service/ITaskTaskService.java
index 4067099..69be42c 100644
--- a/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/service/ITaskTaskService.java
+++ b/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/service/ITaskTaskService.java
@@ -17,4 +17,5 @@ public interface ITaskTaskService extends IService<TaskTask> {
     boolean multiFlowStart(TaskTask taskTask,String userName,Integer intervalType, Integer startCount) throws Exception;
     Result<?> handleFlowStart(TaskTask taskTask, String username, Integer intervalType, Integer startCount)throws Exception;
     List<TaskTask> getTaskTaskListByBusinessId(String businessId) throws Exception;
+    boolean updateDeptHandlerName(String processInstanceId, String deptHandlerName);
 }
diff --git a/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/service/impl/TaskTaskServiceImpl.java b/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/service/impl/TaskTaskServiceImpl.java
index 971bdaf..419f1d0 100644
--- a/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/service/impl/TaskTaskServiceImpl.java
+++ b/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/tasktask/service/impl/TaskTaskServiceImpl.java
@@ -2,8 +2,11 @@ package org.jeecg.modules.tasktask.service.impl;
 
 import com.alibaba.fastjson.JSON;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang.StringUtils;
 import org.apache.shiro.util.Assert;
+import org.flowable.engine.RuntimeService;
+import org.flowable.engine.runtime.ProcessInstance;
 import org.jeecg.common.api.vo.Result;
 import org.jeecg.modules.extbpm.process.exception.BpmException;
 import org.jeecg.modules.extbpm.process.service.impl.BpmBaseExtApiImpl;
@@ -28,10 +31,13 @@ import java.util.*;
  * @Date: 2026-04-17
  * @Version: V1.0
  */
+@Slf4j
 @Service
 public class TaskTaskServiceImpl extends ServiceImpl<TaskTaskMapper, TaskTask> implements ITaskTaskService {
     @Autowired
     private BpmBaseExtApiImpl bpmBaseExtApiImpl;
+    @Autowired
+    private RuntimeService runtimeService;
     @Transactional(rollbackFor = Exception.class)
     public boolean singleFlowStart(TaskTask taskTask, String userName) throws Exception {
         String jsonString = Optional.ofNullable(taskTask.getJsonData())
@@ -139,4 +145,33 @@ public class TaskTaskServiceImpl extends ServiceImpl<TaskTaskMapper, TaskTask> i
         // 2. 查询不到数据 → MP 本身会返回空集合，不是 null
         return this.list(queryWrapper);
     }
+
+    @Override
+    public boolean updateDeptHandlerName(String processInstanceId, String deptHandlerName) {
+        if (StringUtils.isBlank(processInstanceId) || StringUtils.isBlank(deptHandlerName)) {
+            log.warn("updateDeptHandlerName: processInstanceId 或 deptHandlerName 为空");
+            return false;
+        }
+        // 1. 通过 Flowable RuntimeService 获取流程实例，进而获取 businessKey（即 taskTask ID）
+        ProcessInstance processInstance = runtimeService.createProcessInstanceQuery()
+                .processInstanceId(processInstanceId)
+                .singleResult();
+        if (processInstance == null) {
+            log.warn("updateDeptHandlerName: 未找到 processInstanceId={} 对应的流程实例", processInstanceId);
+            return false;
+        }
+        String businessKey = processInstance.getBusinessKey();
+        if (StringUtils.isBlank(businessKey)) {
+            log.warn("updateDeptHandlerName: processInstanceId={} 的 businessKey 为空", processInstanceId);
+            return false;
+        }
+        // 2. businessKey 即为 taskTask 的主键 ID，直接通过 ID 查询
+        TaskTask taskTask = this.getById(businessKey);
+        if (taskTask == null) {
+            log.warn("updateDeptHandlerName: 未找到 id={} 对应的 taskTask", businessKey);
+            return false;
+        }
+        taskTask.setDeptHandlerName(deptHandlerName);
+        return this.updateById(taskTask);
+    }
 }