Abstract: In order to improving the developing efficiency of P2P application,and reducing the developing costs,presents the concept of P2P Service Middleware,and constructs P2P Intelligent overlay Middleware Model which separates the basic P2P service from the special function of Internet application and encapsulates to independent middleware to support different P2P servers.The model,1) by utilizing topology detecting technology of physical network based on the application layer,optimizes P2P overlay topology to according with the topology of physical network;2) gather physical neighboring node of peer to construct a virtual super-peer that service to other nodes as a whole,which weakens the effect of peer churn to system performance;3) uses link evaluating algorithm to choose the optimal routing path,and to improve the searching and transmitting efficiency of system.Finally,simulating lab and system testing results show that this model improves system performance obviously.