Directional energy accumulation blasting pre-splitting and cutting seam has obvious angle and height effects: pre-splitting and cutting seam has a certain angle, which can smoothly break the direct roof, cut off the roof of the roadway and the roof of the mined-out area, and ensure that the roof of the roadway will not be greatly affected after the coal seam is mined out; Reasonable cutting length can ensure that the direct roof can realize integral pulling and breaking under the action of its own gravity and the overlying load exerted on the direct roof by roof subsidence deformation, thus creating conditions for cutting and forming roadsides.