Abstract: According to the problems of using conventional drilling of full hydraulic drilling construction for coal seam floor grouting reconstruction in Zhaogu No.1 Coal Mine, ZDY-6000LD hydraulic crawler directional drilling technology is used to carry out inclined drilling and branched drilling at working face, and grouting reinforcement construction of directional drilling for coal seam floor is completed. It is achieved a major breakthrough in advance prevention and control of water disasters, which plays a "multi-purpose with one hole" role in advance management of regional coal floor grouting, and increases the effective aperture of drilling in aquifer and the rate of drilling fracture and advanced detection of geological structures.