diff --git a/backend/src/main/java/com/designhub/service/TaskItemService.java b/backend/src/main/java/com/designhub/service/TaskItemService.java
index b438ea3..0e24942 100644
--- a/backend/src/main/java/com/designhub/service/TaskItemService.java
+++ b/backend/src/main/java/com/designhub/service/TaskItemService.java
@@ -49,6 +49,10 @@ public class TaskItemService {
     // 排队解锁服务（延迟注入避免循环依赖）
     @org.springframework.beans.factory.annotation.Autowired
     private TaskUnlockService taskUnlockService;
+    
+    // 部门月度积分服务（用于子任务完成时发放积分）
+    @org.springframework.beans.factory.annotation.Autowired
+    private DeptMonthlyScoreService deptMonthlyScoreService;
 
     /**
      * 获取可接单的子任务列表
@@ -795,8 +799,34 @@ public class TaskItemService {
 
         log.info("子任务 {} 已完成", itemId);
 
-        // 5. 设计师立即获得积分（如果需要，可以调用积分服务）
-        // scoreService.addScore(userId, item.getTotalScore());
+        // 5. 🔥 子任务完成时立即发放积分到接单部门
+        if (item.getReceiverDeptId() != null && item.getTotalScore() != null 
+            && item.getTotalScore().compareTo(java.math.BigDecimal.ZERO) > 0) {
+            try {
+                // 计算是否延误
+                boolean isDelayed = false;
+                java.math.BigDecimal delayHours = java.math.BigDecimal.ZERO;
+                if (item.getDeadline() != null && item.getCompleteTime() != null 
+                    && item.getCompleteTime().isAfter(item.getDeadline())) {
+                    isDelayed = true;
+                    long delayMinutes = java.time.Duration.between(item.getDeadline(), item.getCompleteTime()).toMinutes();
+                    delayHours = java.math.BigDecimal.valueOf(delayMinutes).divide(java.math.BigDecimal.valueOf(60), 2, java.math.RoundingMode.HALF_UP);
+                }
+                
+                // 发放积分到部门月度统计
+                deptMonthlyScoreService.addEarnedScore(
+                    item.getReceiverDeptId(),
+                    item.getTotalScore(),
+                    isDelayed,
+                    delayHours
+                );
+                
+                log.info("🎉 子任务 {} 积分已发放: deptId={}, score={}, isDelayed={}, delayHours={}", 
+                    item.getItemNo(), item.getReceiverDeptId(), item.getTotalScore(), isDelayed, delayHours);
+            } catch (Exception e) {
+                log.error("子任务积分发放失败: itemId={}, error={}", itemId, e.getMessage(), e);
+            }
+        }
 
         Map<String, Object> result = new HashMap<>();
         result.put("completedItem", item);