Abstract: This paper analysis features and defect about these model existed, propose a trust model based on super node named TSN (Trust Super Node), Improve these algorithms about joining of node, trust degree of peers between groups.Peers' similarity and response delay are considered to trust calculation, and weights for direct trust and indirect trust are dynamically adjusted.Strategies are considered for model's robustness.The simulation shows that propose model has advantages in successful request and system security over the exiting P2P trust models.