提出了一种新的在P2P系统中基于声誉的信任评估机制.该机制较全面地考虑了影响信任度的因素,改进了局部声誉与全局声誉的计算方法,降低了信任度的计算负载,并引入了黑名单机制。实验结果表明,该机制能有效地评估节点的信任度,识别和隔离恶意节点,提高系统交易成功率,并能有效地应用于P2P系统中。 This paper proposes a new trust evaluation mechanism based on reputation in P2P system, which considers the factors affecting trust comprehensively, improves the calculation method of local reputation and global reputation, reduces the computational load of trust and Blacklist mechanism introduced. Experimental results show that this mechanism can effectively evaluate the trust of nodes, identify and isolate malicious nodes, improve the success rate of system transactions, and can be effectively applied to P2P systems.