Abstract: In order to study the spontaneous combustion characteristics of the same group of coal, three coal samples from Huainan Mining Area were selected for the programmed temperature experiment, the oxygen consumption rate and exothermic intensity of each coal sample were analyzed, the characteristic temperature of each coal sample and the activation energy and pre-exponential factors of coal-oxygen compound reaction were calculated by integral method. The results show that: the oxygen consumption rate and exothermic intensity of Xinzhuangzi 11^# coal are smaller than that of Zhangji 6^# coal and Panyi 8^# coal; the characteristic temperature of the same coal is close, and the critical temperature is between 70 ℃ and 80 ℃, drying temperature is between 115 ℃ and 125 ℃; the activation energies and pre- exponential factors of each coal sample increase with the progress of the reaction. The reaction is divided into three phases according to the characteristic temperature point: in phaseⅠ, the activation energies and pre-exponential factors of Xinzhuangzi 11^# coal were higher than that of Panyi 8 coal and Zhangji 6^# coal; in phaseⅡ, the activation energies and pre-exponential factors of Zhangji 6^# coal are all larger than that of Xinzhuangzi 11^# coal and Panyi 8^# coal; in phase Ⅲ, the activation energies and pre-exponential factors of Panyi 8^# coal are larger than that of Zhangji 6^# coal and Xinzhuangzi 11^# coal.