Abstract: Pingshang Coal Mine is a coal and gas outburst mine. The fully mechanized mining face adopts stratified mining and U-type ventilation. Due to the high gas content, the coal seam is pre-pumped, the adjacent drilling holes are drilled, and the upper corner is intubated. However, the methane concentration in the upper corner of working face is still between 0.5% and 0.7% during the mining period. In order to reduce the gas concentration in the upper corner, the original goaf treatment method is analyzed and improved. Through increasing the diameter of airtight intubation in upper corner, using the new type of gas pipe bracket extraction technology in upper corner and high-level long strike borehole extraction method at 2305 upper fully mechanized working face, the gas concentration in upper corner of working face effectively reduced from 0.3% to 0.4%, which provides the guarantee for safe production in the working face.