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In oxidation and spontaneous combustion of coal not only releases a certain amount of heat,but also releases different gases.We can find that a certain relationship between the decomposition of the gas composition and concentration of coal temperature.According to it has developed a set of low temperature oxidation experimental device,by its on-site coal sample experimental test,it is feasible using the preferred indicator gas to predict early coal natural fire and the practical application of effect is true.At the same time it is pointed out that different mine has different selected indicator gases and the selected indicator gases in different areas of the same coal seam mining are not the same,so it must be determined bv on-site sampling and experimental analysis.