Abstract: The hydropyrolysis characteristics of Shenmu coal and its macerals were investigated using TG-151 thermobalance, and the evolved gases were on-line analyzed by Mass Spectroscopy. The results show that vitrinite has higher volatile yield, maximum weight loss rate and lower peak temperature. Vitrinite produces more C1～C4 lighter hydrocarbons and C6～C8 aromatic hydrocarbons than inertinite during hydropyrolysis, suggesting that vitrinite has higher aliphatic hydrogen content and lower aromaticity. Compared with inertinite, vitrinite has a higher water yield, which is consistent with that the vitrinite has higher phenolic-OH content. The difference in the evolved gases and water between pyrolysis and hydropyrolysis shows the effect of hydrogenation and hydrocracking during hydropyrolysis.