Abstract: Taking five forest types such as Xing'an larch birch mixed forest as the main research object, the pyrolysis process of the sample was analyzed by TG-DTG curve by thermogravimetric analysis, the kinetic analysis of the rapid pyrolysis stage of the sample was carried out by Coats-Redfern integral method, and the comprehensive analysis of ignition temperature, activation energy E and pyrolysis characteristic index P was carried out, in order to evaluate the fire resistance of each combustible sample. The results show that 264 ~ 411 ℃ is the rapid pyrolysis stage and the main stage of thermal weight loss, and the weight loss reaches more than 82.26% of the initial weight loss. Among them, the activation energy E of Xing'an larch forest is relatively high, the thermal stability is relatively strong, the pyrolysis characteristic index P of Xing'an larch birch mixed forest is relatively low, and the pyrolysis behavior is relatively difficult. Building Xing'an larch birch mixed forest as a fire prevention tree species and establishing a fire isolation zone can reduce the combustibility of the forest and reduce the possibility of forest fire.

Key words: Bilahe forest, thermogravimetric analysis, Coats-Redfern integral method, activation energy, pyrolysis characteristic index