The invention relates to a method and a system for realizing connection between X11 client and X11 server. The method comprises the following steps: step 1, a pseudo server is started and used for intercepting the connection request sent by the X11 client and the claim for connection request sent by the X11 server; step 2, when the pseudo server intercepts the connection request sent by the X11 client, the pseudo server establishes connection with the X11 client as the X11 server; step 3, when the pseudo server intercepts the claim for connection request sent by the X11 server, the pseudo server establishes connection with the X11 server as the X11 client; step 4, the pseudo server transmits data package between connected X11 client and X11 server. The invention can realize loosely coupledconnection between the X11 client and the X11 server to facilitate the X11 client not to be influenced by the running state of the X11 server.