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Abstract. Biomass and coal co-combustion power generation, due to the little transformation work and small investment attracts more and more interest. Serials of experiments have to be conducted in determining whether a biomass and a coal are suitable for blending. There is already plenty study on the co-combustion characteristics and ash slagging problems, but few research on the co-combustion curve simulation. In this paper, through the combustion experiments of biomass and coal on Thermogravimetric Analysis (TG) with different ratios, the method of co-combustion curve-fitting and predicting based on the individual fuel combustion TG curve are studied.