Abstract: In order to realize power directly transaction between distributed generations（DG） and loads in microgrid, this paper proposed an electricity transaction mode and strategy in microgrid based on blockchain and continuous double auction（CDA）. Firstly, the buyer and seller shall first complete the transaction matching through CDA. Considering the frequent price fluctuation in CDA market, this paper proposed an adaptive aggressiveness strategy, which enabled the trader to adjust the quotation timely according to the market changes. Then DGs and consumers exchanged trading power digital certificate and expenditure on the blockchain system, and the consumers’ interests were guaranteed by multi-signature if DG defaults. Digital certification of electricity energy assets was replaced by the sequence number with specific tags in the transaction script, and the size of digital certification could be adjusted according to transaction energy quantity. Finally, the feasibility of market mechanism through specific microgrid case and settlement process was also given.