Abstract: N₂706 fully mechanized caving face of Daxing Coal Mine of Tiefa Coal Industry Group had following characteristics: high gas, thick coal seam, easily spontaneous combustion, and igneous rock invasion. Its adjacent working faces N₂702, N₂703 were all sealed due to spontaneous combustion problems during the mining. In the process of mining in N₂706 fully mechanized caving face, through analyzing the reasons for spontaneous combustion, it used the simulation software of gas, fire and air convergence theory to classify the “three zones” in horizontal direction, and the “three areas” in vertical direction, and adopted the comprehensive fire prevention and extinguishing measurements, which mainly included nitrogen injection, combined with sand injection, plugging and water injection as assistant methods. These measurements effectively controlled the coal spontaneous combustion, which ensured mine safety production.