diff --git a/docs/distributed-system/images/dubbo-keep-connection.png b/docs/distributed-system/images/dubbo-keep-connection.png
index acbd619..dbbfd74 100644
Binary files a/docs/distributed-system/images/dubbo-keep-connection.png and b/docs/distributed-system/images/dubbo-keep-connection.png differ
diff --git a/docs/distributed-system/images/dubbo-not-keep-connection.png b/docs/distributed-system/images/dubbo-not-keep-connection.png
index e9e31b2..53c7fd9 100644
Binary files a/docs/distributed-system/images/dubbo-not-keep-connection.png and b/docs/distributed-system/images/dubbo-not-keep-connection.png differ
diff --git a/images/dubbo-keep-connection.png b/images/dubbo-keep-connection.png
index 6f5a593..dbbfd74 100644
Binary files a/images/dubbo-keep-connection.png and b/images/dubbo-keep-connection.png differ
diff --git a/images/dubbo-not-keep-connection.png b/images/dubbo-not-keep-connection.png
index a85a09f..53c7fd9 100644
Binary files a/images/dubbo-not-keep-connection.png and b/images/dubbo-not-keep-connection.png differ