diff --git a/openhis-server-new/openhis-application/src/main/java/com/openhis/web/doctorstation/appservice/impl/DoctorStationMainAppServiceImpl.java b/openhis-server-new/openhis-application/src/main/java/com/openhis/web/doctorstation/appservice/impl/DoctorStationMainAppServiceImpl.java
index 583cf34eb..842b2d662 100755
--- a/openhis-server-new/openhis-application/src/main/java/com/openhis/web/doctorstation/appservice/impl/DoctorStationMainAppServiceImpl.java
+++ b/openhis-server-new/openhis-application/src/main/java/com/openhis/web/doctorstation/appservice/impl/DoctorStationMainAppServiceImpl.java
@@ -324,6 +324,34 @@ public class DoctorStationMainAppServiceImpl implements IDoctorStationMainAppSer
             }
         }
 
+        // 回退链路2：当 encounter 无 orderId 且队列项无 poolId/slotId 时，
+        // 查询患者当天有效挂号订单（order_main），获取 slot_id/pool_id
+        // （挂号流程中 encounter.order_id 可能未被正确赋值，但 order_main 中存在有效记录）
+        if ((divPoolId == null || divSlotId == null) && encounter.getPatientId() != null) {
+            try {
+                Order order = iOrderService.getOne(
+                    new LambdaQueryWrapper<Order>()
+                        .eq(Order::getPatientId, encounter.getPatientId())
+                        .eq(Order::getStatus, OrderStatus.ACTIVE.getValue())
+                        .eq(Order::getDeleteFlag, "0")
+                        .apply("appointment_date::date = %s", LocalDate.now().toString())
+                        .orderByDesc(Order::getCreateTime)
+                        .last("LIMIT 1")
+                );
+                if (order != null && order.getSlotId() != null) {
+                    ScheduleSlot slot = scheduleSlotMapper.selectById(order.getSlotId());
+                    if (slot != null) {
+                        divSlotId = slot.getId();
+                        divPoolId = slot.getPoolId();
+                        log.info("完诊：通过患者当天挂号订单获取号源，orderId={}, slotId={}, poolId={}",
+                            order.getId(), divSlotId, divPoolId);
+                    }
+                }
+            } catch (Exception e) {
+                log.warn("通过挂号订单获取完诊div_log的pool_id/slot_id失败，encounterId={}", encounterId, e);
+            }
+        }
+
         // 如果队列项存在且未完成，更新队列状态为已完成
         // 使用排除法而非白名单：只要不是"已完成"就可以完诊，覆盖跳过、等待等非标准流转状态
         // Bug #401：在更新前记录队列原始完成状态，用于判断是否需要写入 div_log