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.