Abstract: Large-diameter boreholes(?准550 mm)are used to run through coal pillars to replace the connection roadway, the method can effectively control the upper corner gas, reduce the amount of roadway engineering and the cost of gas treatment, improve the construction efficiency and the stability of the ventilation system, and avoid the closed wall damage and floor heave near the wall of the connection roadway caused by the roof pressure during mining. Meanwhile, when the working face has a large amount of gas emission, joint cracks are developed, and the coal body is broken, the problems such as the boreholes are easy to collapse, the formation of holes is difficult, the drilling direction of boreholes cannot be controlled, the construction efficiency is low, can not be solved with the method. Based on the theoretical analysis and field test research, the original construction process is improved, and the large diameter drilling rig and its supporting construction technology is proposed through the directional control of the drilling pipe traction-hole protection pipe of push installation, i.e. the guide drilling pipes control the drilling direction, the drilling is performed synchronously with the installation of the protection pipes, and the boreholes form at one time. The improving construction process controls the drilling direction and overcomes the inability to push in the hole protection pipe when the hole protection pipe is installed after the hole is drilled in the broken coal.