diff --git a/app/db/models/message.py b/app/db/models/message.py
index dfcec276..e54ee178 100644
--- a/app/db/models/message.py
+++ b/app/db/models/message.py
@@ -24,7 +24,7 @@ class Message(Base):
     # 用户ID
     userid = Column(String)
     # 登记时间
-    reg_time = Column(String)
+    reg_time = Column(String, index=True)
     # 消息方向：0-接收息，1-发送消息
     action = Column(Integer)
     # 附件json