Abstract: The co-combustion characteristics of coal and biomass blends were studied on a tube furnace constant-temperature thermo-gravimetric experimental setup, during which the experiemntal results were analyzed using both conventional lnln analytics and the proposed series fitting method, and subsequently the fitting degree and relevant kinetic parameters respectively obtained by above two methods were compared as well. Results show that within the temperature range of 450-500 ℃, for sample blends with an anthracite/corncob blending ratio of 9:1, 8:2, and 7:3, the reaction activation energy calculated by lnln method is respectively 78.81 kJ/mol, 75.53 kJ/mol and 80.88 kJ/mol, which cannot reflect the actual combustion condition of the blends, while the reaction activation energy calculated by series fitting method is 38.13 kJ/mol, 24.82 kJ/mol and 20.82 kJ/mol, presenting a rule that the reaction activation energy decreases gradually with the rise of blending ratio of biomass, which fits with the experimental results. The series fitting method has a broader application scope than the lnln method, and the apparent activation energy calculated by the series fitting method at different blending ratios of biomass can better reflect the difficulty level of the co-combustion of coal/biomass blends at constant temperatures.