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The value of block chain technology is proved by the success of Bitcoin. The characteristics, limitations and its chain structure Hash principle of block chain were analyzed, the applications of block chain technology were researched, the B2B+B2C supply chain each transaction subject transaction structure diagram and dynamic multi-center coordination authentication model based on block chain were proposed. Then the producing process of block chain in B2B+B2C supply chain electronic transaction with example was analyzed, and the facing problems that block chain spreading use in B2B+B2C supply chain enterprise were pointed out. The research results have proposed a new idea for the application of cryptography and block chain.