Abstract: ABSTRACT: With the increasing global attention to climate change, CO2 emission reduction has become an important joint in the development of energy and power field. Thermal power, as a high quality and reliable basic power source to ensure the safety and adjustment of power system, cannot be replaced. Since the electricity generation from coal power accounts for more than 60%, it is the most important source of CO2 emission in China. Therefore, under the dual carbon target, how to find a feasible path for the low-carbon transformation from coal power is an urgent problem to be explored and solved. The National Energy Administration proposed that "coal power + biomass", "coal power + sludge", "coal power + garbage" and "coal power + photothermal" four coupled power generation technologies, which extended a new path for the low-carbon transformation of coal power. Adjustable pawn mountain power generation company after many years of production practice to explore the "coal and gangue", "+ slime coal", "+ sludge coal" and "coal and biomass" multivariate economic fuel coupling power generation technology, and the "+" coal charging the cost to the various research, especially the carbon targets under the carbon cost of research and analysis of the impact of charging the cost. It is expected to improve the efficiency of fuel cost management of coal-fired power plants under the dual carbon target and promote the development of coal-fired power plants.