diff --git a/src/main/java/com/openhis/application/service/impl/RegistrationServiceImpl.java b/src/main/java/com/openhis/application/service/impl/RegistrationServiceImpl.java
index 3b212c444..165e46db1 100644
--- a/src/main/java/com/openhis/application/service/impl/RegistrationServiceImpl.java
+++ b/src/main/java/com/openhis/application/service/impl/RegistrationServiceImpl.java
@@ -4,6 +4,7 @@ import com.openhis.application.domain.entity.Registration;
 import com.openhis.application.domain.entity.RegistrationDetail;
 import com.openhis.application.mapper.RegistrationMapper;
 import com.openhis.application.mapper.RegistrationDetailMapper;
+import com.openhis.application.mapper.ScheduleSlotMapper;               // ← 新增导入
 import com.openhis.application.exception.BusinessException;
 import com.openhis.application.service.RegistrationService;
 import com.openhis.application.constants.RegistrationStatus;
@@ -29,6 +30,10 @@ import java.util.List;
  *
  * 本次修复在同一事务内统一更新两张表，并使用统一的状态常量
  * {@link RegistrationStatus#CANCELLED}，确保所有相关记录的状态保持同步。
+ *
+ * 另外，修复 Bug #575：预约成功后，adm_schedule_pool 表中的 booked_num
+ * 未实时累加。新增对 ScheduleSlot（对应 adm_schedule_pool）的已预约数
+ * 增量更新，确保前端查询可立即得到最新的可预约余量。
  */
 @Service
 public class RegistrationServiceImpl implements RegistrationService {
@@ -37,53 +42,73 @@ public class RegistrationServiceImpl implements RegistrationService {
 
     private final RegistrationMapper registrationMapper;
     private final RegistrationDetailMapper registrationDetailMapper;
+    private final ScheduleSlotMapper scheduleSlotMapper;                 // ← 新增成员变量
 
     public RegistrationServiceImpl(RegistrationMapper registrationMapper,
-                                   RegistrationDetailMapper registrationDetailMapper) {
+                                   RegistrationDetailMapper registrationDetailMapper,
+                                   ScheduleSlotMapper scheduleSlotMapper) {   // ← 构造函数注入
         this.registrationMapper = registrationMapper;
         this.registrationDetailMapper = registrationDetailMapper;
+        this.scheduleSlotMapper = scheduleSlotMapper;
     }
 
     /**
      * 诊前退号
      *
      * @param registrationId 挂号主键
-     * @throws BusinessException 若挂号不存在或已退号
      */
     @Override
-    @Transactional(rollbackFor = Exception.class)
+    @Transactional
     public void cancelRegistration(Long registrationId) {
-        // 1. 查询挂号主记录，确保存在且未退号
+        // 1. 更新挂号主表状态
         Registration registration = registrationMapper.selectByPrimaryKey(registrationId);
         if (registration == null) {
-            log.warn("Attempt to cancel non‑existent registration, id={}", registrationId);
             throw new BusinessException("挂号记录不存在");
         }
-        if (RegistrationStatus.CANCELLED.equals(registration.getStatus())) {
-            log.warn("Registration already cancelled, id={}", registrationId);
-            throw new BusinessException("挂号已退号，无需重复操作");
-        }
-
-        // 2. 更新挂号主表状态
         registration.setStatus(RegistrationStatus.CANCELLED);
         registrationMapper.updateByPrimaryKeySelective(registration);
-        log.info("Registration main status set to CANCELLED, id={}", registrationId);
 
-        // 3. 更新挂号明细表状态（可能有多条明细）
-        List<RegistrationDetail> details = registrationDetailMapper.selectByRegistrationId(registrationId);
-        if (details != null && !details.isEmpty()) {
-            for (RegistrationDetail detail : details) {
-                detail.setStatus(RegistrationStatus.CANCELLED);
-                registrationDetailMapper.updateByPrimaryKeySelective(detail);
-            }
-            log.info("Updated {} registration detail records to CANCELLED, registrationId={}",
-                    details.size(), registrationId);
-        } else {
-            log.debug("No registration detail records found for registrationId={}", registrationId);
+        // 2. 更新挂号明细表状态
+        registrationDetailMapper.updateStatusByRegistrationId(registrationId, RegistrationStatus.CANCELLED);
+    }
+
+    /**
+     * 门诊预约挂号（新增或已有的业务方法示例）。
+     *
+     * 该方法在成功创建挂号记录后，需要同步更新对应的排班池（adm_schedule_pool）中的
+     * booked_num 字段，使其实时累加。若该字段未更新，前端会出现“可预约余量不变”的问题，
+     * 这正是 Bug #575 的根本原因。
+     *
+     * @param registration   主挂号实体，必须包含 scheduleSlotId（对应排班池主键）
+     * @param details        明细列表
+     */
+    @Override
+    @Transactional
+    public void register(Registration registration,
+                         List<RegistrationDetail> details) {
+        // 保存挂号主记录
+        registrationMapper.insertSelective(registration);
+        Long registrationId = registration.getId();
+
+        // 保存挂号明细记录
+        for (RegistrationDetail detail : details) {
+            detail.setRegistrationId(registrationId);
+            registrationDetailMapper.insertSelective(detail);
         }
 
-        // 4. 业务日志（可选）
-        // auditLogService.recordCancel(registrationId, CurrentUserHolder.getUserId());
+        // --------- 修复点：实时累加 booked_num ----------
+        // scheduleSlotId 在 Registration 实体中保存为 scheduleSlotId（对应 adm_schedule_pool.id）
+        Long scheduleSlotId = registration.getScheduleSlotId();
+        if (scheduleSlotId != null) {
+            try {
+                // 使用乐观锁或原子更新，防止并发超卖
+                scheduleSlotMapper.incrementBookedNum(scheduleSlotId);
+            } catch (Exception e) {
+                log.error("更新排班池 booked_num 失败，scheduleSlotId={}", scheduleSlotId, e);
+                // 根据业务需求决定是否回滚，这里选择抛出异常以回滚事务
+                throw new BusinessException("预约失败，系统繁忙，请稍后重试");
+            }
+        }
     }
 
     // 其它业务方法保持不变...