Abstract: Aiming at the poor stability and high dynamic characteristics of terminals in MP2P network,we proposed a dynamic role property based trust model for MP2P networks.This trust model introduces a trade stable factor and time experience value, and the model distributes different roles to nodes dynamically based on nodes’ time experience value and its contribution in different time.The more important the role is,the more weight it has when calculating trust value.The more important the role is,the larger upper limit will be allowed when downloading resource.Simulation proves that this model can prevent effects from unstable nodes,improve stable nodes functions,reduce effects from “free rides” and hypocritical nodes,and improve trade success rate.

Key words: Mobile peer-to-peer networks,Trust model,Dynamic role,Time experience