diff --git a/ssl_manager/route_watcher.py b/ssl_manager/route_watcher.py
index 7211a98..ed131c4 100755
--- a/ssl_manager/route_watcher.py
+++ b/ssl_manager/route_watcher.py
@@ -154,20 +154,28 @@ class RouteWatcher:
     def process_new_domains(self):
         """处理新域名"""
         routes = self.get_all_routes()
-        new_domains = set()
         
-        # 从路由中提取所有域名
+        # 按路由处理，同一路由的多个域名合并到一个证书
         for route in routes:
             route_value = route.get('value', {})
             # 跳过禁用的路由（status=0 表示禁用）
             if route_value.get('status') == 0:
                 continue
+            
+            # 从路由中提取所有域名
             domains = self.extract_domains_from_route(route)
-            new_domains.update(domains)
-        
-        # 处理需要申请证书的域名
-        for domain in new_domains:
-            if self.should_request_cert(domain):
+            if not domains:
+                continue
+            
+            # 过滤出需要申请证书的域名
+            domains_to_request = [d for d in domains if self.should_request_cert(d)]
+            
+            if not domains_to_request:
+                continue
+            
+            # 如果只有一个域名，单独申请
+            if len(domains_to_request) == 1:
+                domain = domains_to_request[0]
                 logger.info(f"发现新域名，准备申请证书: {domain}")
                 try:
                     if self.ssl_manager.request_certificate(domain):
@@ -176,6 +184,18 @@ class RouteWatcher:
                         logger.error(f"证书申请失败: {domain}")
                 except Exception as e:
                     logger.error(f"处理域名异常 {domain}: {e}")
+            else:
+                # 多个域名，合并到一个证书申请（使用 SAN）
+                primary_domain = domains_to_request[0]
+                additional_domains = domains_to_request[1:]
+                logger.info(f"发现同一路由中的多个域名，合并申请证书: {primary_domain} + {additional_domains}")
+                try:
+                    if self.ssl_manager.request_certificate(primary_domain, additional_domains):
+                        logger.info(f"证书申请成功: {primary_domain} (包含 {len(additional_domains)} + 1} 个域名)")
+                    else:
+                        logger.error(f"证书申请失败: {primary_domain} + {additional_domains}")
+                except Exception as e:
+                    logger.error(f"处理域名异常 {primary_domain} + {additional_domains}: {e}")
     
     def run(self, interval: int = 60):
         """运行监听服务"""