Abstract: In order to study the influence of air volume on products from coal low temperature oxidation, the temperature was controlled at constant temperature through temperature programming experiments. The influence of different air volume on gas concentration and generation rate of products from coal oxidation was analyzed. Critical temperature of coal was obtained according to the increasing rate of CO. The results show that there is positive index relationship between CO concentration and generation rate and coal temperature; at a certain temperature, CO and CO₂ concentration decreases with the increase of air volume, but with the increase of air volume, CO and CO₂ generation rate increases first and then decreases; it is found that there is no link between critical temperature of coal and air volume.