Abstract: In order to effectively forecast and prevent coal spontaneous combustion accident in second mining face, it used temperature programming experiment table of coal spontaneous combustion to carry out secondary oxidation temperature programming after pre-oxidized and anaerobic cooling treatment for coal body. The study showed that the CO production rate, oxygen consumption rate and maximum heat intensity in secondary oxidation were higher than those in the initial oxidation, and CO₂ production rate significantly reduced, which had certain guiding significance for monitoring and forecasting coal spontaneous combustion in second mining face.