Abstract: Through analyzing the influence factors that low oxygen concentration is at the return airway corner at part of the mining face and the overlying gob area conducting the surrounding small coal mine gob may lead to the surface leakage in Shendong Mining Area, we summarize and gather the data change of gas composition, air volume, differential pressure of air intake and air return, air leakage condition in working face and working face corner, roadway wind flow state, gas composition in goaf and fire areas, leakage air volume and air leakage direction, air temperature, air pressure inside and outside the firewall. Combining air volume and air pressure adjustment method, series of measures including existing pressure balancing equipment, facilities are used to deal with low oxygen in working face to prevent the leakage of poisonous and harmful gas from the small coal mine goaf to the working surface to ensure safe production of mines.