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Content distribution system can transmit large files rapidly between multiple users, and it has become the most widely used in internet. As a novel technology in communications, network coding technology has received widespread attention in academia. How to use network coding technology in P2P content distribution system is the hot focus of study. This paper propose a network coding algorithm based on trust, namely as CNST algorithm, it can find the high trust node in network. This algorithm can not only achieve network multicast's theory capacity, and when the scale of network is large, it can reduce the execution times of network coding operation, and improve the robustness of the network.