Abstract: In order to optimize the problems of high carbon emissions and low economy in the process of unit operation,this paper proposes an uncertain unit commitment model that considers the Clean Development Mechanism（CDM）,which is better than traditional unit commitment strategies. Taking into account low-carbon aspects is more comprehensive. The paper also considers the two low-carbon elements of large-scale wind farms and electric vehicles,strengthens the connection between low-carbon elements and thermal power units,and promotes the rationalization of energy structure. The formulation of carbon emission trading mechanisms,CO2emission costs,carbon emission quotas,etc. constraints reduces the operating cost of the unit,and provides a reasonable unit combination plan for the clean,low-carbon and economically optimal operation of the system. In this paper,a 10-unit system is taken as an example for simulation analysis. The results show that the proposed model can significantly reduce carbon emissions in the uncertain unit portfolio optimization problem,which is conducive to the low-carbon and economic operation of the unit.