Abstract: The similar simulation experiment device of air inlet system in coal mining area is established by the ratio of 1∶20 according to the similarity principle. The device includes main transportation roadway, auxiliary transportation roadway and connecting roadway. The similar simulation experiment device is used to measure oxygen consumption of coal burned in roadway. Then the heat release rate of coal burned at different time and its curve are obtained based on the oxygen consumption principle. Through analyzing the curve of the heat release rate according to t² mathematical model of the heat release rate, the total heat output is obtained. Experiment obtains that the heat output per unit mass of coal is 432 kJ/kg when the Huhewusu coal samples are burning in roadway.