Abstract: Coal seams occur coal and gas outburst danger and pressure, the influence scope of mined-out area in goaf of reasonable and effective pressure relief scope and coal roadway with the determination of unloading zone width can be done to reduce unnecessary costs, mine roadway arrangement process and ensure safety, eliminate the drivage efficiency under the condition of gas threat, to coal mining to replace strain of emergencies. Taking Bai Ping coal mine 13091 working face and 13111 working face as the research object, adopting the means of numerical simulation and field measurement of the mined-out area pressure relief scope, determination of coal mining working face pressure relief scope, determine the stripe at the unloading coal lane unloading zone width, can optimize the new working face goaf roadway arrangement. In order to work in the goaf pressure relief range. The research results show that :(1) through the excavation simulation of 13091 working face, the law of displacement and stress of 13111 working face with time and stress with space is obtained, and the influence range of pressure relief of 13091 working face goaf should be within 40m; (2) As the distance between the coal seam gas parameter measuring point and the goaf of 13091 working face is close, the measured coal seam gas content of 13111 working face is gradually decreasing; (3) Comprehensive analysis shows that the effective pressure relief area is within 37m from the goaf of 13091 working face, the area from 37 to 42m from the goaf of 13091 working face is the transition area, and the area beyond 42m from the goaf of 13091 working face is the original area.