According to the temperature-time-sampling road map , Dongsheng long flame coal was pyrolyzed in HYLZ-2 aluminum retort low-temperature dry distillation furnace. The effects of pyrolysis mode, temperature and time on desulfurization were analyzed. The kinetic parameters of constant temperature rising stage and constant temperature stage were studied. The results show that 20% of sulfur is removed from solid coal when the temperature rises from 20 ℃ to 245 ℃ at a constant speed of 5 ℃ /min. After isothermal pyrolysis for 320 minutes at 460~510 ℃, 60%~64% of sulfur still remains in the solid coal char. In the constant temperature rising stage, the average desulfurization activation energy and the average desulfurization pre-exponential factor are 30.23 kJ/mol and 35.51, respectively. The activation energy and the natural logarithm of desulphurization pre-exponential factor in the constant temperature stage are 196.72 kJ/mol and 25.689, respectively.