Abstract: In view of a series of problems such as high gas content and difficult extraction caused by the pressure relief gas gushing out of the 23302 working face in Xiayukou Coal Mine, the pressure relief gas of the 23302 working face was intercepted and extracted using the directional long borehole of the floor to intercept and extract the pressure relief gas of the 23302 working face, and the layout and construction plan of the directional long borehole were determined according to the site conditions and the characteristics of the working face, and the engineering application was carried out.In the construction process, the residual gas content of the working face is determined by pre-pumping coal seam gas and using DGC type gas content measuring device.The practical results show that the directional long borehole shows good application results in this project, the borehole gas extraction concentration and pure extraction amount have reached the expected target, the residual gas content of the working face is controlled between 3.72～4.74 m³/t, the analytic gas content is controlled in the range of 1.35～2.37 m³/t, and spray holes and top drilling do not occur during the construction of the residual gas content test borehole, all the measured boreholes are normal, and the gas treatment work has achieved remarkable results, ensuring the safe production of the mine.