In view of the technical difficulties of long distance drilling, high accuracy and poor fault formation in the drainage hole construction for uphill Xisan rail laneway construction in Qianyingzi coal mine, through the technical study on optimization choice of high-power directional drilling equipments, precise design and control of drilling trajectory and strong slag discharge by composite directional drilling, the drainage hole was drilled 443m accurately targeting the predetermined site of laneway with the up-down error of 0.19m and the horizontal displacement error of 1.72m. By the end of December 1, 2017, the total discharge amount reached 3200m3, the tunneling safety of uphill rail and uphill return air channel are effectively protected.