Abstract: Aiming at the problem of prediction and forecasting of coal spontaneous combustion in Donggucheng Coal Mine,gas products and their characteristic laws during the spontaneous combustion of Donggucheng lignite are obtained through coal spontaneous combustion programmed temperature rise experiments under different oxygen concentrations.According to the experimental results,indicator gases and parameters of coal spontaneous combustion prediction and forecasting are proposed.The results show that when the oxygen concentration is constant,with the increase of temperature,the CO concentration basically exhibits exponential function increasing before 200 ℃,and the concentrations of CO₂ and CH₄ exhibit exponential function increasing as a whole.The concentration of C₂H₄ gas first increases rapidly,then slowly increases,and then rapidly increases again.The ratio change situations of the CO/CO₂ and C₂H₄/CH₄ are similar,both increasing first and then decreasing,with the inflection points of the curves corresponding to temperatures around 180 ℃.According to the experimental results,CO and C₂H₄ are selected as the single indicator gases for predicting the spontaneous combustion of lignite in Donggucheng Coal Mine.The CO early warning concentration is set to （30-70） × 10^-6,and the C₂H₄ early warning concentration is set to （1-1.6） × 10^-6.At the same time,the CO/CO₂ ratio and the C₂H₄/CH₄ ratio are used as auxiliary indicators for judging coal temperature.The research results can provide a certain basis for predicting and forecasting coal spontaneous combustion in Donggucheng Coal Mine.