Abstract: The main task of the P2P network is to improve the throughput of the system,so as to provide services for more users.Network throughput directly affects the P2P service availability.In order to improve the availability of the P2P network services,analyze the P2P network bandwidth utilization,put forward an optimized routing model based network throughput, and finish optimization of network throughput through genetic algorithm. Finally,the experimental analysis of the algorithm was given,and verify the effectiveness of the service routing algorithm.