关键词: 对等网络（P2P）, 网络安全, 信任模型, 信任度

Abstract: This paper puts forward a hybrid dynamic trust model in P2P network which can resolve the problems of P2P network such as bad security，hard to management and so on.This model has integrated local trust，recommendation trust and global trust model，by this organic combination each model can take their respective advantage in the best measure.Meanwhile through the relative feedback mechanism，this model can effectively distinguish the change of node trust value，safety problems such as defense exaggeration，slander and so on.The simulation result indicates that this model can effectively distinguish the trust degree of node，at the same time it has the good safety.

Key words: Peer-to-Peer（P2P）, network safety, trust model, trust degree