diff --git a/backend/src/main/java/com/designhub/controller/TaskItemController.java b/backend/src/main/java/com/designhub/controller/TaskItemController.java
index fe54e1c..744be09 100644
--- a/backend/src/main/java/com/designhub/controller/TaskItemController.java
+++ b/backend/src/main/java/com/designhub/controller/TaskItemController.java
@@ -22,6 +22,9 @@ import java.util.HashSet;
 import com.designhub.mapper.TaskMapper;
 import com.designhub.mapper.TaskItemMapper;
 import com.designhub.entity.Task;
+import com.designhub.util.WorkHoursCalculator;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
 
 /**
  * 任务子项控制器（流水线任务）
@@ -39,6 +42,7 @@ public class TaskItemController {
     private final TaskMapper taskMapper;
     private final TaskItemMapper taskItemMapper;
     private final JwtUtil jwtUtil;
+    private final WorkHoursCalculator workHoursCalculator;
 
     /**
      * 获取可接单的子任务列表
@@ -192,6 +196,21 @@ public class TaskItemController {
             // 填充同一主任务的所有子任务列表
             List<TaskItem> subTasks = subTasksMap.get(taskId);
             if (subTasks != null && !subTasks.isEmpty()) {
+                // 为没有deadline的进行中子任务动态计算deadline
+                for (TaskItem subTask : subTasks) {
+                    if (subTask.getDeadline() == null 
+                        && "in_progress".equals(subTask.getStatus())
+                        && subTask.getEstimatedHours() != null 
+                        && subTask.getEstimatedHours().compareTo(BigDecimal.ZERO) > 0
+                        && subTask.getUpdateTime() != null) {
+                        // 使用updateTime作为接单时间（因为接单时会更新updateTime）
+                        LocalDateTime deadline = workHoursCalculator.calculateDeadline(
+                            subTask.getUpdateTime(), 
+                            subTask.getEstimatedHours()
+                        );
+                        subTask.setDeadline(deadline);
+                    }
+                }
                 item.setSubTasks(subTasks);
                 item.setSubTaskTotal(subTasks.size());
             }