Abstract: The traditional method HDHT uses trust mechanism to complete isomerism node location of the resources.When the node selection initial trust is yet not established,some processing power weaker node will generate congestion.Node congestion phenomenon will severely affect the performance of the search algorithm．This paper put forward a trust optimization search p2p node localization algorithm,which is based on credibility,establishes a search interval,in every search process,uses the direct search to optimize the search direction,to ensure that each node can be searched along the trust optimization direction,avoid the disadvantages of repeatly searching node due to p2p network heterogeneous distribution in the traditional algorithm．Experimental results show that this algorithm not only in the initial trust establishment can improve the node resources search efficiency,but also can improve download success rate after setting up trust．Algorithm can be realized in p2p query cycle platform,and the experimental analysis verifies the effectiveness of the proposed algorithm．

Key words: Heterogeneous network,Trust mechanism,Resource location