Focusing on the low-carbon development needs of the power industry and aiming at the problem that the current power market and carbon market can’t coordinate operation,an electricity carbon joint P2P trading mechanism-by introducing electricity P2P trading is designed,it gives users and power generators room to mobilize their flexibility,and provides carbon emission reduction services for thermal power enterprises. At the same time,it helps to promote the consumption of new energy and improve the benefits of all participants. The changes of the benefits of participants in the traditional power market and the trading mode after the introduction of P2P trading and carbon market mechanism is analyzed. According to the demand of the design mechanism,the clearing model of the electricity carbon joint market is established,and the feasibility and effectiveness of the trading mechanism are analyzed through the simulation of a design example.