Abstract: An improved two-tier hybrid P2P network model is proposed on the basis of carefully analyzing the development, advantages and disadvantages of the existing P2P network, and used as the underlying-network foundation of the discovery techniques of Web Services.It mainly improve two aspects of the traditional method:firstly, the CP nodes classification strategy and SP nodes classification strategy are proposed in the net work structure;secondly, a self-adjusting strategy based on user-interested spaces is proposed in the network organization and corresponding searching algorithms of the Web Services.