diff --git a/backend/src/main/java/com/designhub/service/TaskService.java b/backend/src/main/java/com/designhub/service/TaskService.java
index b85d6a3..52b17cc 100644
--- a/backend/src/main/java/com/designhub/service/TaskService.java
+++ b/backend/src/main/java/com/designhub/service/TaskService.java
@@ -1674,7 +1674,12 @@ public class TaskService {
         }
         
         // 验证任务是否是流水线任务
-        if (existTask.getIsPipeline() == null || existTask.getIsPipeline() != 1) {
+        // 特殊情况：一级需求部门任务在待完善明细状态下，允许将非流水线任务转换为流水线任务
+        boolean isPrimaryTaskPendingDetail = existTask.getIsPrimaryTask() != null 
+                && existTask.getIsPrimaryTask() == 1 
+                && "pending_detail_completion".equals(existTask.getApprovalStatus());
+        
+        if ((existTask.getIsPipeline() == null || existTask.getIsPipeline() != 1) && !isPrimaryTaskPendingDetail) {
             throw new BusinessException(ResultCode.PARAM_ERROR, "该任务不是流水线任务");
         }
         
@@ -1745,6 +1750,7 @@ public class TaskService {
         // 更新主任务信息
         existTask.setTitle(dto.getTitle());
         existTask.setPipelineMode(dto.getPipelineMode());
+        existTask.setIsPipeline(1); // 确保设置为流水线任务
         existTask.setScore(totalScoreDecimal);
         existTask.setEstimatedHours(BigDecimal.valueOf(totalHours));
         existTask.setQuantity(totalQuantity);