Abstract: In order to solve the problem of micro air leakage and spontaneous combustion in the closed goaf of the working face under the condition of deep well and high pressure mining, taking the 11501 closed goaf of zhujixi coal mine as an example, the changes of gas composition, pressure distribution and temperature in the closed goaf were monitored and analyzed. It was considered that the air pressure difference acting on the closed goaf has formed a slight air leakage effect, which is the main reason for the oxidation and spontaneous combustion of the coal in the goaf. Based on this, this Paper puts forward the pressure equalizing fire-fighting technology, which combines the ventilation system with the pressure equalizing chamber. The field practice shows that: after combined pressure equalizing, the CO concentration in the closed goaf was reduced to below 2 × 10-6, the O2 concentration was reduced to 4%, the relative positive pressure in the closed wall of the two roadways fluctuates at 180 Pa, and the difference of the closed internal pressure in the two roadways is basically stable at 10 Pa. This measure could effectively prevent and control the system problem of air leakage in the goaf, and achieve the purpose of restraining the spontaneous combustion of the remaining coal in the goaf.