To provide theoretical guidance for grading utilization of coal in Renlou Coal Mine, pyrolysis tests of different maceral have been conducted on the basis of maceral separation. Results show that with increase of pyrolysis temperature, three kinds of macerals at 400-570 ℃ show apparent weightlessness. The exinite group begins pyrolysis around 400 ℃, and weightlessness reaches the largest point when weight loss rate peak temperature reaches about 450 ℃ ; the vitrinite and inertinite groups begin pyrolysis at 420 ℃ and weightlessness peak temperature is about 475 ℃. During the whole pyrolysis process, the weight loss rate of the exinite was 39%, and the average maximum pyrolysis rate was 0.95 mg/(g·min); the weight loss rate of the vitrinite group was 32.5%, and the average maximum pyrolysis rate was 0.53mg /(g·min). The weightlessness rate of inertinite group was 29.5%, and the average maximum pyrolysis rate was 0.49 mg/(g·min).