Aiming at the serious problem of spontaneous combustion of coal seam in 31301 working face of ChahaSu Mine. Firstly, the industrial analysis of coal samples in the working face shows that the coal quality of the working face belongs to non-caking coal, which has the characteristics of low ignition point, high moisture content and no caking. By testing the marked gases of spontaneous combustion of coal samples, it is concluded that CO and C2H4 can be used as the representative gas of spontaneous

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... combustion of coal oxidation to judge the spontaneous combustion of coal seams. According to the field monitoring data, the three-zone distribution of spontaneous combustion is calculated, and compared with the three-zone distribution of spontaneous combustion under the condition of fully closed simulation, the factors affecting the three-zone distribution of spontaneous combustion are obtained. Combining with the results of experimental analysis, the law of spontaneous combustion is studied and the reasonable advancing speed of working face is determined, which provides theoretical support for the formulation of enterprise fire prevention and extinguishing measures.