Due to lack of effective mechanisms to improve the security performance of the system, there are a lot of malicious behaviors in P2P network. So,the trust model is an important research topic for the P2P application. It conducts the research on F2P network based on the trust model and divides different groups by the interest between peers. In this model,the global trust value can be computed by combining the trust value in direct peer,in interest group,between interest groups and multiple control factors. Through the simulation experiment, this model is verified to have high ratio of successful download,and the peer load can be controlled in a admissible range.%目前在P2P网络中,缺乏有效的机制来提高系统的安全性,存在许多恶意行为,信任模型已经成为P2P应用研究的一个重要课题.文中对基于信任机制的P2P网络进行研究,根据节点的兴趣、爱好建立不同群组,节点总体信任度由节点之间直接信任度、组与节点之间信任度、组间信任度以及多重参数合成,并通过针对诋毁恶意节点攻击、协同作弊攻击两种不同的攻击模式下的仿真实验表明,该模型具有较高的下载成功,并且能使节点负载处于可控范围内.
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