Abstract: The combustion reactivity of chars from pyrolysis of Shenmu coal maceral concentrates under different pyrolysis temperature, heating rate and pressure were systematically investigated by using TGA.The results indicated that the combustion reactivity of chars was related to pyrolysis temperature, pressure,heating rate and distribution of elements in chars.With decreasing temperature and pressure and increasing heating rate,the combustion reactivity of the pyrolysis residues increased.The lower carbon content and higher hydrogen content in chars,the higher combustion reactivity of chars.Under the same pyrolysis condition,the vitrinite chars had higher combustion reactivity than the fusinite chars.