diff --git a/backend/src/main/java/com/designhub/service/TaskApprovalService.java b/backend/src/main/java/com/designhub/service/TaskApprovalService.java
index ea4db7b..89f870a 100644
--- a/backend/src/main/java/com/designhub/service/TaskApprovalService.java
+++ b/backend/src/main/java/com/designhub/service/TaskApprovalService.java
@@ -645,17 +645,25 @@ public class TaskApprovalService {
         Task task = getTaskForApproval(taskId, "pending_receiving_approval");
         validateApprover(task, approverId, "receiving_leader");
 
-        // 退回给需求部门负责人
+        // 退回给需求部门负责人，如果没有负责人则退回给发起人
         Department demandDept = departmentMapper.selectById(task.getPublisherDeptId());
-        if (demandDept == null || demandDept.getLeaderId() == null) {
-            throw new BusinessException(ResultCode.PARAM_ERROR, "需求部门负责人不存在");
+        Long targetApproverId = null;
+        String targetApproverRole = "demand_leader";
+        
+        if (demandDept != null && demandDept.getLeaderId() != null) {
+            targetApproverId = demandDept.getLeaderId();
+        } else {
+            // 一级需求部门可能没有负责人，退回给发起人
+            targetApproverId = task.getPublisherId();
+            targetApproverRole = "publisher";
+            log.warn("需求部门{}没有负责人，任务退回给发起人{}", task.getPublisherDeptId(), task.getPublisherId());
         }
 
         task.setApprovalStatus("rejected_by_receiving");
         task.setStatus("draft");
         task.setRejectReason(reason);  // 保存驳回原因
-        task.setCurrentApproverId(demandDept.getLeaderId());
-        task.setCurrentApproverRole("demand_leader");
+        task.setCurrentApproverId(targetApproverId);
+        task.setCurrentApproverRole(targetApproverRole);
         taskMapper.updateById(task);
 
         logApproval(taskId, approverId, 2, "reject", reason);
@@ -670,8 +678,8 @@ public class TaskApprovalService {
         );
         log.info("已通知任务发起人: publisherId={}", task.getPublisherId());
         
-        // 2. 如果需求部门负责人不是发起人，也通知需求部门负责人
-        if (!demandDept.getLeaderId().equals(task.getPublisherId())) {
+        // 2. 如果需求部门负责人存在且不是发起人，也通知需求部门负责人
+        if (demandDept != null && demandDept.getLeaderId() != null && !demandDept.getLeaderId().equals(task.getPublisherId())) {
             notificationService.sendNotification(
                 demandDept.getLeaderId(),
                 "任务已被驳回",