Abstract: In this paper, a high-performance three-edged auger drill rod was designed for the large inclined broken soft and low-permeability coal seam in Aiweiergou mining area of Xinjiang, which has better torque performance, larger slag discharge channel and better hole wall stability. The three-edged auger structure not only improves the slag discharge efficiency of the drill rod, but also effectively solves the stuck drilling and buried drilling accidents caused by the caving hole and collapsed holes by rotating the drill rod and repeated hole washing when drilling into broken soft coal seams. It can effectively improve the drilling depth of broken soft coal seam.The wind pressure required for different hole depths of three-edged auger drill rod is revealed: 0.44 MPa for hole depths of 0 m to 50 m, 0.53 MPa for hole depths of 50 m to 100 m, 0.61 MPa for hole depths of 100 m to 150 m, 0.67 MPa for hole depths of 150 m to 200 m. A set of construction technology is proposed for long-hole drilling in large inclined broken soft and low-permeability coal seam. For the 25222 headentry in the 2130 Coal Mine, 20 downward long boreholes were constructed in the lower wall and the drainage test of downward long boreholes was carried out. Within 60 days of drainage, the pure methane extraction volume decreases rapidly from 0.10 m³/min to 0.04 m³/min in the first 10 days, slowly decreases from 0.04 m³/min to 0.02 m³ in the next 30 days, and slowly increases from 0.02 m³/min to 0.04 m³/min in the last 20 days, reaching the target of the drainage test. The test results show that the use of three-edged auger drill rod + medium wind pressure slag discharge drilling process can effectively solve the problems of low porosity, shallow hole depth and long construction period of conventional rotary drilling. It lays a foundation for the application and popularization of the technology to solve the strip gas in the working face by using downward long borehole in Aiweiergou mining area in Xinjiang.