Abstract: Taking barefoot type rare earth mine as research object.Replacing aquifer thickness with average aquifer thickness, and after seepage stability, the calculation method of saturation line with two parabola forms of impermeable floor is established using Boussinesq equation.The influence of surface shape parameters of impermeable floor and liquid injection intensity on the saturation line is analyzed.It is found that surface shape parameters of impermeable floor and liquid injection intensity have obvious effects on the saturation line.The distribution of liquid injection intensity in horizontal direction is analyzed by using the calculation method of established saturation line.It is shown that the more flat the impermeable floor is, the more uneven the distribution of liquid injection intensity is, and the larger the liquid collection area is.The liquid injection intensity increases with the increase of the thickness of the ore layer.