Abstract:Because the transaction mode of microgrid is still being explored, this paper tries to solve this problem by using block chaining technology and does research on this problem. This paper first introduces the block chain briefly from the aspects of characteristics, classification and basic framework, then analyzes the characteristics of the micro grid transaction, and obtains the common characteristics of both centralization, intellectualization, security and reliability, so that the block chain is applied to the basis of the microgrid transaction. On this basis, the basic framework of the power transaction of micro grid is established. The energy flow is realized by the cooperation of block chain and Internet of things technology. After the information flow is introduced into the block chain, the information flow is more intelligent and reliable. Then, the technology realization is analyzed and discussed, the right of account in the micro grid transaction is clarified, and two kinds of mechanism are also put forward to encourage new energy to participate in the cancellation. Finally, the difficulties faced by the block chain technology in power trading are explained, which is mainly that energy flow is constrained by reality and resource problems.