With the rapid development of P2P(Peer-to-Peer) network, the main problem needs to be solved is how to guarantee the safety of interaction. Trust system has been proved one of the most effective technology to solve the security problem. But the trust update mechanism in the current trust system is still not perfect, which degrade the actual availability of the trust system in P2P network. In this paper, we incorporate the trust context and the preferences of different agents with the trust update mechanism,...