Abstract: Through the oxidation experimental of coal samples in different temperature conditions, the curve of consuming oxygen rate and the curve of producing carbon monoxide are obtained. The results show that different particles of coal samples have different rate of oxygen consumption and different rate of producing carbon monoxide under certain temperature conditions. But the particle has little effect on oxygen cunsumed rate and the carbon monoxide rate when the ambient temperature is too low. As the increase of ambient temperature, it will become increasingly evident.The smaller of the particle and higher of temperature, the more of oxygen consumed and carbon monoxide produced.