diff --git a/plugins/message_summary/main.py b/plugins/message_summary/main.py
index 8045a60..ade3d4f 100644
--- a/plugins/message_summary/main.py
+++ b/plugins/message_summary/main.py
@@ -325,9 +325,6 @@ class MessageSummaryPlugin(MessagePluginInterface):
 
             self.LOG.info(f"找到 {len(enabled_groups)} 个开启定时总结的群聊")
 
-            # 获取所有联系人
-            all_contacts = ContactManager.get_instance().get_all_contacts()
-
             # 为每个群生成总结
             for group_id in enabled_groups:
                 try:
@@ -345,14 +342,17 @@ class MessageSummaryPlugin(MessagePluginInterface):
 
                     self.LOG.info(f"群 {group_id} 昨天有 {message_count} 条消息，开始获取内容")
 
+                    # 获取群成员信息
+                    group_members = ContactManager.get_instance().get_group_members(group_id)
+
                     # 获取群名
-                    group_name = all_contacts.get(group_id, group_id)
+                    group_name = ContactManager.get_instance().get_nickname(group_id)
                     group_name = self._sanitize_group_name(group_name)
 
                     # 获取昨天的聊天记录
                     chat_content = self.message_storage.get_messages_by_date_range(
                         group_id,
-                        all_contacts,
+                        group_members,
                         yesterday_start,
                         yesterday_end
                     )