Abstract: In order to study the pressure relief range and gas emission width after extraction of stope, according to the gas geological condition of Xinji No.2 Mine 1^# coal seam, field measurement of gas content, drilling cuttings and analytical indexes are carried out along the lateral direction of the goaf in 210108 stope, combined with the numerical simulation results, the width of lateral pressure relief range is determined. The results of field test data and numerical simulation show that the width of gas unloading pressure in the 210108 working face of 1^# coal seam is 0 to 12 m; the lateral vertical stress within the range of 0 to 10 m from the goaf is the stress reduction zone; combined with the actual situation of the field, it is determined that the pressure relief width of this surface is 10 m.