Abstract: In order to maximize the effect of predrainage in this coal seam,this paper takes Malan Coal Mine as the research object,aiming at the gas occurrence situation in Malan Coal Mine and the drainage measures adopted at this stage,explores the hole diameter,hole depth,layout,sealing quality and increasing coal seam permeability of drainage boreholes.Practice shows that the above methods can be used effectively.To improve the predrainage effect of coal seam and ensure the safe production of working face.

Key words: Gas pressure, Permeability index, Control effect, Predrainage of coal seam