Abstract: In view of the problems of large dip angle of coal seam and soft broken coal seam of 32# coal seam in the construction of long borehole along the coal seam in the 313 working face of Qinan Coal Mine, using double power head rig and auxiliary drilling tools, the research on drill pipe and casing double pipe directional drilling technology is carried out; through the selection of key equipment, selection of drill pipe and drill pipe bit, selection of casing and casing bit, optimization of pneumatic directional drilling process parameters, and the proposed drilling pipe in the casing of large diameter screen hole protection methods and tests, all theses effectively improve the depth of drilling along the coal seam, realize the control of the long drilling path along the coal seam, and improve the adaptability of the formation.