Trust　management　is　fundamental　for　information　security　in　peer　to　peer　network.　There　are　several　models　which　applied　distributed　method　to　construct　trust　between　peers,　but　there　is　no　way　to　guarantee　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-government　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.