Abstract: Peer-to-Peer（P2P） network is self-organizing，dynamic and expansible system.In view of the limitations in studying resources-sharing of P2P networks by the micro，static methods etc，the paper establishes the evolutionary game model of resources-sharing in P2P networks based on the view of evolutionary game theory，and analyses its dynamic evolutionary procedure.The results show that the system’s evolutionary direction is closely related to player’s payoff，and influenced by system’s initial status.Moreover，key factors that affect the system’s evolution，cooperation profit，initial cost of the cooperation，differences of resources between peer and discount gene of the partners，are obtained and researched in this paper.

Key words: P2P networks, peer, resources-sharing, evolutionary game

摘要： 根据P2P网络的自组织、动态性、可扩展性等特点，针对当前P2P网络资源共享的微观、静态等研究方法的局限性，运用演化博弈理论方法，建立了一个P2P网络节点资源共享机制的演化博弈模型，分析了网络节点资源共享的动态演变过程。研究结果表明，该系统的演化方向与双方博弈的支付矩阵相关，同时与系统初始状态相关。并得出，共享产生的超额利润、共享的初始成本、节点服务能力的差异及其贴现因子是影响网络资源共享演变的关键因素。

关键词: P2P网络, 节点, 资源共享, 演化博弈