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The lack of quality of service in an existing P2P network services, especially service Composition with little regard to quality of service guarantees, this lead to very difficult to succeed in commercial P2P service areas, also affects the P2P service composition theory. This paper will introduce service quality attributes into P2P network services, in combination with QoS attributes and characteristics of P2P to establish QoS-based P2P service composition model. then the penalty function algorithm is given. Finally, experimental show that the proposed penalty function algorithm for calculating the P2P service composition have a good time performance. The QoS-based P2P service composition model can effectively meet user requests by considering both QoS attribution and P2P service, and thus promote large-scale application of P2P services composition.