Abstract: The catalytic effect of single and mixed catalysts including two single catalysts with 3% Ca and 5% Na-BL, and one 3% Ca+5%NaBL mixed catalyst on carbon conversion, gasification reaction rate, relative amount of harmful pollutant like sulphur containing gases under temperature ranging from 750℃ to 950℃ and ambient pressure conditions were investigated by thermogravimetry in mixing (air/steam) gasification for three highmetamorphous anthracites of Longyan, Fenghai, and Youxia coals. The mixed BL+Ca catalyst has a synergetic effect in comparison with only using single BL and Ca catalyst. At mixing gasification the mixed catalyst of 3% Ca+5% NaBL greatly increases the carbon conversion and reaction rate by accelerating the reactions of C+CO2→2CO and C+H2O→CO+H2 because of the presence of alkali surface compounds \COM\ and \CO2M\, and exchanged calcium phenolate and calcium carboxylate (COO)2. This catalytic action is stronger than steam gasification. By adding CaCO3 into BL catalyst in gasification less than 900℃, the catalytic ability is improved with increasing coal conversion and effective desulphurization.