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A new Web server cluster architecture with high scalability and reliability which supports Web QoS is proposed. The functions previously concentrated on a single dispatcher are distributed in this architecture, the traffic bottleneck of the dispatcher is alleviated, and the single point fault of dispatcher is avoided, so the scalability and reliability of the cluster system can be enhanced. Accessing locality on server is guaranteed by synchronous load transferring. The load balancing among the servers is achieved through a mechanism based on load vector. By measuring in experimental system, the increasing of throughput has linear relationship with the number of servers. So the QoS of the whole system is guaranteed.