The variable-density solute transport model based on the Advection-Dispersion Equation is widely used to study theseawater intrusion. And the hydraulic dispersion coefficient significantly affects the model simulation performance. This paperadded side pumping tests into traditional soil column solute transport experiment, and utilized numerical inversion method toestimate the horizontal and vertical dispersivity. The estimated result was verified by applying other solute transport test. Comparedwith traditional method, this method can estimate the dispersivity in different directions on the premise that we do notincrease the experimental complexity, which improves the efficiency and saves the cost of experiment. The approach providedby this study can be widely used to estimate the anisotropy of hydraulic parameters, such as conductivity and dispersion coefficient.