Abstract: Trust management is fundamental for information security in peer to peer network.There are sev- eral models which applied distributed method to construct trust between peers,but there is no way to guaran- tee security of the peer's behavior.In this paper,the nature of the trust is considered,and the paper present a highly self-governing trust model for peer to peer network.This model enhances the ability of self-govern- ment of peers,for the security of the peers each peer holds a local trust table for those who have exchanged information with it directly,and can determine the other indirect peers trust degree by subjective reasoning method.This improves the open net-work self-adaptability,and gives a new and valuable way for studying trust management in P2P network.