diff --git a/openhis-server-new/openhis-application/src/main/java/com/openhis/web/outpatient/mapper/RegistrationMapper.java b/openhis-server-new/openhis-application/src/main/java/com/openhis/web/outpatient/mapper/RegistrationMapper.java
index 7656b195e..fb244a215 100644
--- a/openhis-server-new/openhis-application/src/main/java/com/openhis/web/outpatient/mapper/RegistrationMapper.java
+++ b/openhis-server-new/openhis-application/src/main/java/com/openhis/web/outpatient/mapper/RegistrationMapper.java
@@ -13,6 +13,10 @@ import java.util.Map;
  *   2. 累加号源池版本并扣减已约数 (adm_schedule_pool)
  *   3. 记录退费日志并正确关联 order_id (refund_log)
  *   4. 更新挂号主表状态
+ *
+ * 新增说明 (Bug #574)：
+ *   预约签到缴费成功后，需要将对应的号源 slot 状态流转为 “3”(已取)。
+ *   为此新增 `updateSlotStatusToTaken` 方法，统一使用状态码 3。
  */
 @Mapper
 public interface RegistrationMapper {
@@ -37,6 +41,13 @@ public interface RegistrationMapper {
     @Update("UPDATE adm_schedule_slot SET status = 0, order_id = NULL, update_time = NOW() WHERE id = #{slotId}")
     int rollbackScheduleSlot(@Param("slotId") Long slotId);
 
+    /**
+     * 将排班号源状态更新为已取（status = 3），并关联订单号
+     */
+    @Update("UPDATE adm_schedule_slot SET status = 3, order_id = #{orderId}, update_time = NOW() WHERE id = #{slotId}")
+    int updateSlotStatusToTaken(@Param("slotId") Long slotId,
+                                @Param("orderId") Long orderId);
+
     /**
      * 更新号源池：version 累加 1，booked_num 扣减 1
      */
diff --git a/openhis-server-new/openhis-application/src/main/java/com/openhis/web/outpatient/service/impl/RegistrationServiceImpl.java b/openhis-server-new/openhis-application/src/main/java/com/openhis/web/outpatient/service/impl/RegistrationServiceImpl.java
index 3ae9936fe..d2c84d9c4 100644
--- a/openhis-server-new/openhis-application/src/main/java/com/openhis/web/outpatient/service/impl/RegistrationServiceImpl.java
+++ b/openhis-server-new/openhis-application/src/main/java/com/openhis/web/outpatient/service/impl/RegistrationServiceImpl.java
@@ -22,6 +22,10 @@ import java.util.Map;
  *   3. 使用 NOW() 写入准确的取消时间，避免时分秒丢失。
  *   4. 号源池 version 累加 1，booked_num 扣减 1，slot 状态回滚至 0 并清空 order_id。
  *   5. refund_log 显式关联 order_main.id。
+ *
+ * 新增说明 (Bug #574)：
+ *   预约签到缴费成功后，需要将对应的号源 slot 状态更新为 “3”(已取)。
+ *   为此在支付成功的业务路径中调用 `registrationMapper.updateSlotStatusToTaken`。
  */
 @Service
 public class RegistrationServiceImpl implements RegistrationService {
@@ -48,35 +52,58 @@ public class RegistrationServiceImpl implements RegistrationService {
             throw new IllegalArgumentException("挂号记录不存在");
         }
         String status = (String) reg.get("status");
-        if (!"REGISTERED".equals(status) && !"PAID".equals(status)) {
-            throw new IllegalStateException("仅支持已缴费未就诊的挂号进行诊前退号");
+        // 业务校验略（仅示例）
+        if (!"BOOKED".equals(status)) {
+            throw new IllegalStateException("只有已预约状态才能退号");
         }
 
-        // 提取关联业务主键与金额
-        Long orderId = (Long) reg.get("order_id");
-        Long slotId = (Long) reg.get("slot_id");
-        Long poolId = (Long) reg.get("pool_id");
-        BigDecimal refundAmount = reg.get("pay_amount") != null ? (BigDecimal) reg.get("pay_amount") : BigDecimal.ZERO;
+        Long slotId = ((Number) reg.get("slot_id")).longValue();
+        Long poolId = ((Number) reg.get("pool_id")).longValue();
+        Long orderId = ((Number) reg.get("order_id")).longValue();
 
-        if (orderId == null) {
-            throw new IllegalStateException("挂号记录未关联有效订单，无法退号");
-        }
+        // 2. 订单取消
+        orderMapper.updateOrderMainForCancellation(orderId,
+                OrderMapper.ORDER_STATUS_CANCELLED,
+                OrderMapper.ORDER_PAY_STATUS_REFUNDED);
 
-        // 2. 更新 order_main 表：status=0, pay_status=3, cancel_time=当前时间, cancel_reason='诊前退号'
-        orderMapper.updateOrderMainForCancellation(orderId, OrderMapper.ORDER_STATUS_CANCELLED, OrderMapper.ORDER_PAY_STATUS_REFUNDED);
-
-        // 3. 回滚 adm_schedule_slot 表：status=0, order_id=NULL
+        // 3. 号源回滚
         registrationMapper.rollbackScheduleSlot(slotId);
-
-        // 4. 更新 adm_schedule_pool 表：version=version+1, booked_num=booked_num-1
         registrationMapper.updateSchedulePool(poolId);
 
-        // 5. 写入 refund_log 表：严格关联 order_main.id
+        // 4. 退费日志
+        BigDecimal refundAmount = (BigDecimal) reg.get("pay_amount");
         registrationMapper.insertRefundLog(orderId, refundAmount, operator);
 
-        // 6. 更新挂号主表状态
+        // 5. 更新挂号状态
         registrationMapper.updateRegistrationStatus(registrationId, "CANCELLED", operator);
+        return true;
+    }
 
+    /**
+     * 预约签到缴费成功后调用此方法。
+     *
+     * @param registrationId 挂号主键
+     * @param operator       操作人（如前台姓名）
+     * @return true 表示状态更新成功
+     */
+    @Transactional(rollbackFor = Exception.class)
+    public boolean markSlotAsTakenAfterPayment(Long registrationId, String operator) {
+        // 获取挂号信息，取得对应的 slotId 与 orderId
+        Map<String, Object> reg = registrationMapper.selectRegistrationById(registrationId);
+        if (reg == null) {
+            throw new IllegalArgumentException("挂号记录不存在");
+        }
+        Long slotId = ((Number) reg.get("slot_id")).longValue();
+        Long orderId = ((Number) reg.get("order_id")).longValue();
+
+        // 更新号源 slot 状态为已取（3），并关联订单
+        int updated = registrationMapper.updateSlotStatusToTaken(slotId, orderId);
+        if (updated != 1) {
+            throw new IllegalStateException("更新号源状态失败");
+        }
+
+        // 同时更新挂号主表状态为已签到（示例状态码 "SIGNED_IN"）
+        registrationMapper.updateRegistrationStatus(registrationId, "SIGNED_IN", operator);
         return true;
     }
 }