Abstract: Based on coal mine in Bulianta tower 8.0 m large mining height coal seam occurrence condition and the hydrogeological conditions, the state of numerical simulation and theoretical calculation analysis method, studies the 8.0 m working face of large mining height are broken water inflow, water storage space and water flowing fractured zone height and the strength of the artificial waterproof seal. The results show that the water gap of the high working face of 12511 is directly communicated to the surface, and the crack ratio is 23.78, which meets the requirements of the construction of underground reservoir to guide the water channel. Through the analysis of large mining height are broken on the working plane of fracture structure and the boundary strata overburden stratum displacement path curve, determine the mined-out area's largest water is about 5058773 m3, meet the requirements of underground reservoir for storage. Through the analysis of the strength requirements of the coal pillar and the artificial waterproof sealing wall, the safety technical requirements of the operation of underground reservoir are put forward. Based on the above analysis results, the requirements of the construction of the underground reservoir in the coal mine are met with the requirements of water source, storage capacity and water channel.