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In order to resolve the problems in P2P system, such as security, bad management and single computation of trust value in current trust model, a domain-based multi-factor trust model in P2P system is proposed. This model is based on the hybrid P2P network structure, calculates trust value of nodes by using multi-factor. The data model and the way of trust value calculation are proposed. The simulation proves that this model can isolate and identify malicious peers efficiently, with high performance of security.