Abstract: In order to confirm the adaptive capacity of the solar auxiliary power generation system in the light-coal complementation system,this paper calculated the heat consumption of the light-coal complementation system across the plant under the different percentage of solar-thermal flow and then conducted quantitative analysis on the coupling input system of these two heat resources to compute the dual-source input enthalpy after coupling and decoupling,so as to ascertain the heat consumption of the auxiliary power system for electricity generation and the amount of molten salt demanded by its thermal storage system under different operation modes.Meanwhile,by utilizing the Ebsilon software simulation,this paper obtained that the estimated maximum installed capacity of the single solar auxiliary power generation system while running the complementation system after decoupling was 16.965 MW under the different percentage of solar-thermal flow. finally,the coal-saving amount of running the light-coal complementation system under three operating conditions set by the coal-saving solutions could be obtained.