Abstract: The char-CO2 gasification reaction at elevated temperature was investigated kinetically via the temperature-programmed thermogravimetry using STA409PC thermal analyzer, where the influence of heating rates on gasification reactivity was emphasized and the kinetic parameters were calculated by the Freeman and Ozawa methods. The results showed that the heating rate affects the reaction greatly, and that the higher the rate, the higher the conversion rate from char into CO2 within the same period. However, there is on upper bound for the heating rate, which varies in accordance to different coal origins. In addition, the relevant DTG (derivative thermogravimetry) curve moves forwards higher temperature with increasing heating rate, and the peak temperature and maximum reaction rate increase as well. The activation energy of coal char used in ANSTEEL and BENSTEEL is about 110 kJ/mol, while that supplied by Fuxin Coal Mine is just 87 kJ/mol.