Session synchronization technology mainly has the following several:session synchronization based on cookie, session synchronization based on database, session synchronization based on distributed cache. Based on the above session synchronization technologies, this paper gives a session synchronization technology based on instant copy of cluster node. This technology stores session id information in client to avoid store full session information in client, thus avoids the danger of user identity information exposure. Besides, in the process of sending a request to the server, only taking session id instead of complete session information. This greatly reduces transmitted data, so then improves the access efficiency of the client to server. Sychronizing session information between cluster nodes, there is no need to get session information from database which avoids performance bottlenecks on using database frequently. It also does not need specialized session cache servers, which cuts the cost of development and deployment. So, it has good application prospects.