Abstract: The 8^# and 12^# coal seams are main mining seams in Tangshangou Coal Mine. Because 11^# coal seam belongs to spontaneous combustion coal seam, in mining 8^# and 12^# coal seams, there is obvious difference between the air leakage state, strength, residual coal spontaneous combustion zone and single coal seam mining area. The old goaf of 11^# coal seam is interconnected with the goaf of the coal seam working face. Under the effect of negative pressure ventilation, the influence of air leakage on spontaneous combustion of floating coal in goaf is aggravated objectively. The distribution of “three zones” of spontaneous combustion in the goaf and the gas concentration field in the goaf are changed. At the same time, it is difficult to control the hidden danger of spontaneous combustion. Therefore, SF₆ tracer gas is used to detect the air leakage laws between earth surface, 8^# coal seam, 11^# coal seam and 12^# coal seam. Thus, the air leakage passage is blocked by a definite target. And then, a comprehensive prevention and control system for spontaneous combustion of coal seam is established.