The synergistic interaction of rice husk (RH), Huaibei bituminous coal (HB coal), and their blends was investigated under O 2 /CO 2 combustion condition by thermogravimetric analysis. The RH was blended with HB coal in the range of 20-40 wt% to investigate the co-combustion profile. Meanwhile, a horizontal tube furnace was used to study the sulfur release characteristics of blended fuels under O 2 /CO 2 atmosphere. Results showed that the synergistic interaction between RH and HB coal improved the char catalytic effect and alkali metals melt-induced effect on the decomposition of HB coal. Burnout temperature (T b ) of blended fuels decreases significantly with an increase of RH ratio and oxygen ratio, ignition temperature (T i ) decreases with increases of RH ratio, while there is a minor decrease in T i at higher oxygen ratio. Combustion characteristic indexes of blended fuel increase with an increase of RH ratio and oxygen ratio. The SO 2 peak values decrease with increases of RH ratio, and increase with an increase of oxygen ratio and temperature. However, the mean SO 2 emissions and fuel-S conversions show the inverse trend.