diff --git a/com/openhis/web/outpatient/mapper/RegistrationMapper.java b/com/openhis/web/outpatient/mapper/RegistrationMapper.java
index 4cb275a97..5cb8820cb 100644
--- a/com/openhis/web/outpatient/mapper/RegistrationMapper.java
+++ b/com/openhis/web/outpatient/mapper/RegistrationMapper.java
@@ -3,48 +3,43 @@ package com.openhis.web.outpatient.mapper;
 import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Param;
 import org.apache.ibatis.annotations.Update;
-import org.apache.ibatis.annotations.Select;
 
 /**
  * 门诊挂号相关数据访问层
  *
  * 新增：
- *   1. {@code incrementBookedNumByOrderId(Long)}：在预约成功后实时累加
- *      {@code adm_schedule_pool.booked_num}，防止并发导致预约数不准确。
- *   2. {@code selectPoolIdByOrderId(Long)}：辅助获取对应的 pool_id。
- *
- * 该实现使用乐观锁（WHERE booked_num = oldBookedNum）+ 行锁，确保并发安全。
+ *   1. {@link #updateSlotStatusToPaid(Long)} – 在预约签到缴费成功后，将对应的号源
+ *      {@code adm_schedule_slot} 表的 {@code status} 字段更新为 3（已取号），
+ *      解决 Bug #574。
+ *   2. {@link #incrementBookedNumByOrderId(Long)} – 在预约成功后实时累加
+ *      {@code adm_schedule_pool.booked_num}，用于 Bug #575（已在其他提交中实现）。
  */
 @Mapper
 public interface RegistrationMapper {
 
-    /** 根据订单 ID 查询对应的排班池 ID */
-    @Select("SELECT pool_id FROM his_order WHERE id = #{orderId}")
-    Long selectPoolIdByOrderId(@Param("orderId") Long orderId);
+    /**
+     * 将对应的号源状态更新为已取号（status = 3）。
+     *
+     * @param slotId 号源主键 ID
+     * @return 受影响的行数
+     */
+    @Update("UPDATE adm_schedule_slot SET status = 3 WHERE id = #{slotId}")
+    int updateSlotStatusToPaid(@Param("slotId") Long slotId);
 
     /**
-     * 实时累加预约池的已预约人数（booked_num）。
+     * 预约成功后，累加对应排班池的已预约数量。
      *
-     * <p>使用原子 UPDATE，避免先查询后更新的并发问题。</p>
-     *
-     * @param orderId 订单主键
-     * @return 更新的记录数，通常为 1；若为 0 表示 pool_id 不存在或已被删除。
+     * @param orderId 订单 ID，用于关联到 adm_schedule_pool
+     * @return 受影响的行数
      */
-    @Update({
-        "<script>",
-        "UPDATE adm_schedule_pool",
-        "SET booked_num = booked_num + 1",
-        "WHERE id = (SELECT pool_id FROM his_order WHERE id = #{orderId})",
-        "</script>"
-    })
+    @Update("<script>" +
+            "UPDATE adm_schedule_pool " +
+            "SET booked_num = booked_num + 1 " +
+            "WHERE id = (" +
+            "  SELECT pool_id FROM adm_schedule_slot WHERE id = (" +
+            "    SELECT slot_id FROM his_order WHERE id = #{orderId}" +
+            "  )" +
+            ")" +
+            "</script>")
     int incrementBookedNumByOrderId(@Param("orderId") Long orderId);
-
-    /**
-     * 将号源状态更新为已取号（status = 3），用于支付成功后流转状态。
-     *
-     * @param orderId 订单ID
-     * @return 更新记录数
-     */
-    @Update("UPDATE adm_schedule_slot SET status = 3 WHERE order_id = #{orderId}")
-    int updateSlotStatusToPaid(@Param("orderId") Long orderId);
 }
diff --git a/com/openhis/web/outpatient/service/impl/RegistrationServiceImpl.java b/com/openhis/web/outpatient/service/impl/RegistrationServiceImpl.java
index 199f43e06..89ee856fe 100644
--- a/com/openhis/web/outpatient/service/impl/RegistrationServiceImpl.java
+++ b/com/openhis/web/outpatient/service/impl/RegistrationServiceImpl.java
@@ -6,6 +6,8 @@ import com.openhis.web.outpatient.service.RegistrationService;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.Map;
+
 /**
  * 门诊挂号业务实现
  *
@@ -41,18 +43,33 @@ public class RegistrationServiceImpl implements RegistrationService {
             throw new IllegalArgumentException("订单ID不能为空");
         }
 
-        // 1. 更新订单状态为已支付（此处使用 OrderMapper 中新增的常量）
+        // 1. 更新订单状态为已支付（使用 OrderMapper 中新增的常量）
         int orderUpdated = orderMapper.updateOrderStatusToPaid(orderId, OrderMapper.ORDER_STATUS_PAID);
         if (orderUpdated == 0) {
             throw new RuntimeException("订单状态更新为已支付失败，orderId=" + orderId);
         }
 
-        // 2. 将对应的号源状态更新为已取号（status = 3），修复 Bug #574
-        int slotUpdated = registrationMapper.updateSlotStatusToPaid(orderId);
+        // 2. 获取订单关联的号源 slot_id
+        Map<String, Object> order = orderMapper.selectOrderById(orderId);
+        if (order == null) {
+            throw new RuntimeException("未找到对应订单，orderId=" + orderId);
+        }
+        Object slotIdObj = order.get("slot_id");
+        if (slotIdObj == null) {
+            throw new RuntimeException("订单未关联号源，无法更新号源状态，orderId=" + orderId);
+        }
+        Long slotId = Long.valueOf(String.valueOf(slotIdObj));
+
+        // 3. 将对应的号源状态更新为已取号（status = 3），修复 Bug #574
+        int slotUpdated = registrationMapper.updateSlotStatusToPaid(slotId);
         if (slotUpdated == 0) {
-            throw new RuntimeException("号源状态更新为已取号失败，orderId=" + orderId);
+            throw new RuntimeException("号源状态更新为已取号失败，slotId=" + slotId);
         }
 
-        // 3. （可选）如果还有其他业务，如发送通知等，可在此继续处理
+        // 4. 同步累加排班池已预约数量，修复 Bug #575
+        int poolUpdated = registrationMapper.incrementBookedNumByOrderId(orderId);
+        if (poolUpdated == 0) {
+            throw new RuntimeException("排班池已预约数量累加失败，orderId=" + orderId);
+        }
     }
 }