With the acceleration of China’spower market construction process, more and more new energy and customer-side resources will become main participants of market transactions. Unlike traditional thermal power generators, these renewable energy generators have more flexible bidding strategies and more complex and variable bidding behaviors, which also bring more risks to the power market, and there is an urgent need for a spot market trading mechanism applicable to the participation of renewable energy generators.Thus,aspotmarketbilateraltradingmechanismisdesigned, an offer model for renewable energy generators and the cus tomer side are analysed and established. Then, aCoVaR - based systematic risk index for market participants is constructed, a systematic risk assessment method for different market players is given, and a risk- averse clearing model for bilateral trading in the spot market is proposed. Finally, the systemic risk of different subjects is calculated through simulation of arithmetic cases, and the results of market transactions without and with the systemic risk clearing model are analyzed to verify the effectiveness of the model.