Abstract: In order to solve the problem of gas drainage difficulty and long outburst elimination time in soft coal seams in Southwest China, during the period of 8^# outburst coal seam exposed by cross-cut in Xinwei Coal Mine, the seam slot was formed by multiple high pressure hydraulic slotting with a single borehole, at the same time, medium pressure water injection was applied to realize the permeability enhanced of directional hydraulic fracturing of coal seam, the permeability of coal seam to be exposed was increased, and the pre-extraction time was shortened. The results show that the seam slot formed by high pressure hydraulic slotting plays a certain guiding role for hydraulic fracturing, a coherent plastic zone is formed by hydraulic fracturing fracture and seam slotting; after the hydraulic measures, the permeability of coal seam is improved, the gas drainage flow of single hole is increased by 2 times on average; the average drainage concentration of single borehole is increased about 3 times on average, cross-cut rapid uncovering coal is realized.