Shenan’ao Coking Coal Co., Ltd. adopted pre-crack blasting technology to conduct pre-crack and blast the top seam along the middle of the air return roadway of the 20104 fully mechanized mining face to achieve the technical purpose of pre-cracking and top pressure relief. The field experiments and observation data showed that, for 14.3 m small coal column and 4.9 m thick coal seam, the top rock stratum can collapse along the edge of the mining area in time after the comprehensive mining surface backfilling, improve the stress field state in the rock stratum and the stability of the downstream trough surrounding rocks, relieve the pressure on the roof, achieve the technical goal of slowing down the 20106 transport downstream trough and the support pressure concentration of the small coal column, reduce the deformation of the surrounding rocks in the roadway, and the pressure of the coal seam. The purpose of the maintenance cost of the roadway is to provide reference for the maintenance of the mining roadway in the same geological conditions of the comprehensive mining face.