In light of the problems such as insufficient single hole depth， short effective hole interval， low drilling efficiency， small drilling diameter， etc. with conventional drilling from the working face at Liuhuanggou Coal Mine， it was proposed to use the narrow compact ZDY4000LD （C） type crawler drill， and directional drilling tools and accessories such as the second generation MWD system （YHD2-1000 （A）） to drill cross-bed directional long holes so as to improve drilling accuracy， and increase hole depth and drilling diameter， while reduce increased working face gas emission problems due to coal mining. Four directional， large diameter， cross-bed long holes were field test-drilled with depth over 300m， hole completion rate up to 100%， the deepest depth of 399m， the largest diameter of ?193mm， the total drilling footage of 1581m， average depth of 395.25m， and significant increase in borehole gas extraction efficiency. Among them， the No.3 borehole provided the maximum extraction mixed flow rate of 8.3m³/min， the maximum extraction net volume 1.6m³/min， and the gas extraction concentration 51%， resulting in significant gas extraction effect.