Journal of Networking Technology Han Yingjun, Wang Xiaoyang 10 3 2019 https://doi.org/10.6025/jnt/2019/10/3/79-86 http://www.dline.info/jnt/fulltext/v10n3/jntv10n3_2.pdf In recent years, because of anonymity and dynamics, P2P network have suffered from more and more security problems, which means that traditional trust management cannot be well adapted to P2P network environment, making dynamic trust a new research focus. Based on trust mechanism in P2P environment, this paper analyzes the trust of consumption node to service node, coming upon an advanced trust evaluation model pointing at information exchange among nodes to evaluate credit changes when service provider exchanging information. With risk mechanism, this paper also analyzes risks of information exchange among nodes in P2P network. It is proved that the model mentioned can effectively resist credit speculation and periodic deception.