Abstract: Energy trading between microgrids can reduce the dependence on public bulk power grids. This paper studies the blockchain based microgrid peer-to-peer（P2P）energy trading. Firstly,consumers and producers in the microgrid can trade the energy without a third party. Then a demurrage mechanism is introduced in the proposed model and a dynamic pricing model is established,enabling the energy consumption optimization and minimum electricity charge of the microgrid and providing sufficient energy for the microgrid.Finally,the simulation results verify the effectiveness of the proposed model.