In this paper,we analyzed the linkage relationship between the electric supply and demand,CO₂ emission limit value and resource supply and economic target value,so that the cost optimization programming model could be built under the CCER and CDM mechanism.The balance point would be found between the optimal cost of the system and the CO₂ emissions in the inevitable risk condition.The results showed that coal-fired power plant,oil-fired power plant,biomass power plant,wind power and hydropower would increase expansion capacity of 200MW,200MW,100MW,450MW and 300MW,the total CO₂ emissions was[208.15,275.38]×10⁶t,emissions of CO₂ by coal-fired and oil-fired power plant accounted for total emissions of[82.8%,87.9%].In addition,CCER and NEM could accurately dig CO₂ reduction potential out in the multi-power areas,for example,under the CCER mechanism,CO₂ emission reduction were[5.83,6.12]×10⁶t,[8.95,9.78]×10⁶t and[11.57,14.22]×10⁶t each period,at the same time,NEM mechanism could effectively promote the clean energy development and expansion.Carbon emission reduction mechanism was conducive to realizing the goal of "high carbon" to "low carbon",so that the decision-makers could formulate a scheme of "energyeconomy-environment".