Abstract: The accumulation of coal gangue not only poses great harm to the environment,but also causes great waste of resources. Adding biomass helps improve the combustion performance of coal gangue,and co-combustion is an efficient method for handling both coal gangue and biomass. Co-pyrolysis experiments of coal gangue and major biomass components (lignin, cellulose,and hemicellulose) were carried out by the combination of thermogravimetric analysis with Fourier transform infrared spectroscopy to investigate the influence of biomass components on coal gangue pyrolysis,along with the interaction in pyrolysis weight loss and gas product characteristics between coal gangue and biomass components. The results show that the blending of lignin,cellulose and hemicellulose in coal gangue can reduce the initial decomposition temperature and peak temperature of the mixture,improve the comprehensive pyrolysis index and promote the pyrolysis of coal gangue. The interaction mechanism between the main components of coal gangue and biomass in terms of thermal weight loss is related to pyrolysis temperature and blending ratio. The blending of a small amount of cellulose and hemicellulose has a great influence on the gas products of coal gangue,and the addition of lignin changes the release law of CO₂ from coal gangue. Based on the influence of the main components of biomass on the pyrolysis process of coal gangue and the interaction of pyrolysis weight loss,it is suggested that the blending ratio of lignin should be greater than 50%,while the blending ratio of cellulose and hemicellulose should be controlled within 25%.