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In this work, an optimization model of load balancing in P2P network is proposed to make full use of each node resource, and to consider the coordination of network resource allocation between the other network area and this area, making the whole network resource can be used as fully as possible, based on the load information of the different nodes, we layer the nodes and use an undirected graph to link each node. We put the ratio that come from the adding two nodes load capacity divided by the volume of the optimal load between the adjacent nodes as the strength of the road weights. When node load need several nodes to finish at the same time, find the optimal path of transfer load doing load transfer. And in need not considering several nodes load transfer, we can accord to the information of node list record to load or to join the node. It can optimize the load balancing in Peer to Peer Network and achieve high speed, it also can reduce the cost of load delay.