diff --git a/client/group_msg.go b/client/group_msg.go
index b50fb9c5..a3951b2b 100644
--- a/client/group_msg.go
+++ b/client/group_msg.go
@@ -42,7 +42,7 @@ func (c *QQClient) SendGroupMessage(groupCode int64, m *message.SendingMessage,
 			useFram = false
 		}
 	}
-	msgLen := message.EstimateLength(m.Elements, 703)
+	msgLen := message.EstimateLength(m.Elements, 5000)
 	if msgLen > 5000 || imgCount > 50 {
 		return nil
 	}