The ground large-diameter drilling technology was described in detail from construction equipment, drilling technology, casing cementing and other procedures. The technology was applied in Wangyun Mine, and the DQ-Ⅱ water level intelligent monitoring system was installed to continuously automatically record and collect air changes in stagnant water level. Practice showed that the application effect of large-diameter drilling technology on the ground was good, and the water level of mined-out water continued to drop, reduced the cost of drainage of goaf water in the No. 3 coal seam, without large area of water in the first mining area.