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Thin client system is very important to those network based applications, such as network computer system. This paper proposed a new conception, called service net, to organize and manage multi-server based thin client systems. For multi-server extension, general method and service net based method are compared. With service net, multi-server based thin client systems can be well managed by the policies for user account management, redundant storage, request distribution, load balancing, fault tolerance, fault shifting, dynamic joining and quitting. A prototype system based on Tsinghua Network Computer System is implemented. The results show that QoS of service net based method is more stable and better than the one of general method.