Abstract: In order to solve the problem of seasonal pit water surplus and water shortage in Baorixile Open-pit Mine and realize the reasonable storage and utilization of water resources in the mine area, based on the study of geological, hydrogeological and structural conditions of the mine area, the water quality characteristics of the mine and the treatment of typical pollution components were studied. The results show that Baorixile Mining Area was located in the complete Chenqi Coalfield hydrogeological unit, it was a wavy high plain landform, and the Quaternary floor was higher than the regional groundwater level, which belongs to the permeable and non-water bearing stratum; the hydraulic connection between the aquifers of the Cretaceous Damoguaihe Formation was not obvious, and the coal seam was the main water bearing medium. Controlled by the geological structure and paleogeographic environment, the east, south and north sides of Baorixile Mining Area are water separation boundaries, and the west was recharge boundary, forming a relatively closed syncline water storage structure. The east side of the first mining area is an anticline axis, and a NNW normal fault （Ｆ₁₅） is developed. Due to the interlacing of aquifers, a natural dam with good water resisting performance （ｄａｍ ｗｉｄｔｈ ＞ 200 ｍ） is formed between the first mining area and the second mining area. The construction of underground reservoir in the west side of the first mining area can not only ensure the safety of dump and mining pit in the second mining area, but also realize the effective water storage in the west side of the first mining area, and the water storage capacity can be increased 119.0 × 10⁴ m³. There is a great seasonal difference in water use in the mining area. The surplus of mine water in winter and spring is 72×104 to 81×10⁴ m³. The turbidity of Baorixile Mine water can be reduced to the limit of water quality standard by coagulation and precipitation pretreatment and surface soil strengthening treatment, which can realize the quantity and quality safety of underground storage of mine water. The effective protection and sustainable utilization of mine water in Baorixile Mining Area are realized by determining safe underground water storage location and developing scientific and reasonable pretreatment process.