Abstract: The high-water poor sealing hydrology long-term observation hole which is hard to seal on the ground uses underground sealing scheme. Through the methods of geophysical prospecting combined with drilling, hole-sealing combined with plugging, ground combined with underground grouting, the aquifers up and down the hydrological holes are carried out sealing grouting to cut down the hydraulic connection of aquifers around the hydrological holes, and then effect analysis, verification and evaluation are carried out to get the goal of controlling drilling water diaster.