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As the existing trust model is not suitable for the semi-distributed mobile P2P network, a dynamic trust model based on super node SDTM is presented. Trust relation is categorized into two kinds: ordinary node and ordinary node, super node and super node, and each solution for the two kinds is put forward. Meanwhile, SDTM solves the problem of the ordinary node dishonest feedback using direct trust tree of super-node. The simulation result shows, SDTM can effectively deal with the dishonest feedback of network attacks over the existing trust models, and legitimate nodes have a higher success request rate.