Abstract: In order to eliminate the outburst danger of the serious outburst seam and to improve the seam gas pre-drainage rate and the driving speed of the gatew ay driving face in the outburst seam, based on the railway gateway of No.YX001 coal mining face in Y'an Mine of Yima Coal Mining Group as the research background, a research was conducted on the construction technique of the permeability improvement technology with the hydraulic flushing borehole passing through strata and th e permeability improvement effect. The site application showed that the permeability technical measures of the hydraulic flushing borehole passing through strata could r educe the gas pressure in the seam and could improve the permeability.After the hydraulic flushing borehole operations, the residual gas content in the seam would be reduced to 3.346 .43 m3/t and the outburst danger of the seam could be effectively eliminated.The gas content highly released from the seam could make the driving sp eed of the outburst seam gateway increased over two times, make the driving speed at 70 m per month (a cross section of 18.3 m2) and could have a excellent compre hensive outburst prevention and control effect.