Abstract: According to characteristics analysis of main aquifer in mining area, we determine T₁j aquifer is of significance for the protection, followed by P₃c aquifer. Two reconstruction methods for aquifer, which are sealing poor boreholes and grouting to unsealed section, pressure grouting in separated strata fracture zone, are proposed in this paper. Also, we analyze and conclude that the optimal pressure grouting horizon is T₁f⁷ aquifuge in the tensile zone, followed by P₃l/P₃c separation cracks in separated strata fracture zone. Finally favorable location for aquifer reconstruction is classified, which provides the theory basis to prevent water disaster in karst mountain coal mine and optimize the utilization of groundwater resources.