Abstract: The oxidation heating experiment of coal with different degrees of metamorphism was carried out by means of programmed heating experiment device, the relationship between critical temperature change, CO, CO₂ and CH₄ concentration change in the experimental process were analyzed. The results show that: the critical temperature increases with the increase of metamorphic coal of 64.79 ℃（long flame coal）, 69.86 ℃（non-caking coal） and 71.23 ℃（gas coal）; the concentration of CO, CO₂ and CH₄ decreases with the increase of the metamorphic degree. To a certain extent, the tendency of spontaneous combustion of coal decreases with the increase of coal metamorphism.