Abstract: Advance borehole pressure release is proposed according to strata behaviors and deformation characteristics of roadways in brittle and extra thick coal seam of Luxin Mining Area. The effect of pressure release of different borehole diameters, different borehole lengths, composite pressure release and large diameter spiral borer is analyzed by numerical simulation. Larger diameter, longer borehole, composite pressure release with blasting and large diameter spiral borer will have better effect. Underground site experiment showed that borehole pressure release was effective, which made roof bedding separation reduce about 20%. If the diameter was larger or large diameter spiral borer was used, better pressure release effect would be obtained.