Abstract: The pyrolysis kinetics of Chinese white poplar black liquor was studied via thermogravimetric analysis in present study. The results indicated that the pyrolysis of black liquor was a 4-stage process. The peak temperature of DTG and the solid content increased with the rise of heating rates, while the number of side peaks declined. The analyzed pyrolysis kinetics of by Zsokó method is a complicated model, of which the reaction of the first and third stages was 1st order, the second stage and the last stage were in accordance with the 4th and 2nd reaction order. During the two main stages of the pryolysis process at 150-450℃ and 450-650℃, the lowest activation energies were observed at the heating rate of 40℃/min. They represented 87.380 and 99.294 kJ/mol respectively. The activation energy between 150℃ and 450℃ stage decreased, while it increased during the following stage with the rising heating rates.