Abstract: The pyrolysis and co-pyrolysis process of wheat straw and lignite are studied by thermogravimetry,and the kinetic analysis of the thermal weight loss data is carried out. Using Coats-Redfern method to fit the thermogravimetric data,it was found that the reaction order has little effect on wheat straw,but has greater effect on lignite. Combining thermogravimetric analysis and kinetic analysis,it is concluded that when wheat straw and lignite are mixed in different proportions during co-pyrolysis,there is no obvious synergistic effect.Instead,there may be an effect of inhibiting decomposition for each other,and when wheat straw and lignite are mixed with a mass ratio 5∶5,the inhibitory effect is weakest.