Abstract: In order to solve the problem of large deformation of the goaf roadway along the 1404 track of a mine in Shanxi Province under the influence of high supporting pressure, the pre-cracking blasting roof cutting technology was used to relieve the pressure of the roadway roof.The deformation characteristics and pressure relief effects of the roof under different roof cutting heights(4,8 and 12 m)and different roof cutting angles(0°,15° and 30°)were analyzed by using discrete element numerical simulation software, and the deformation characteristics of the surrounding rock of the roadway under different support conditions were compared and analyzed.The results show that the roof cutting height of 12 m and the roof cutting angle of 15° are the roof cutting parameters suitable for the engineering geological characteristics of the goaf roadway along the 1404 track, and the deformation of the surrounding rock is effectively controlled by the anchor rod + anchor cable support method, and the deformation of the surrounding rock of the roadway is finally stable at 57～171 mm.