Abstract: In order to verify the two-region model and the variable-density model describing the solute transport in transition zone seawater intrusion， the solute transport experiments of the soil columns having diameter of 9 cm and 11 cm and the comparative experiments between the two-region model and the variable-density model have been designed in this study. Taken the determination coefficient and mean square error as model validation evaluation indexes， it is found that the two-region model can describe the solute transport more exactly than the normal CDE model. In the comparative experiments， both the two-region model and the variable-density model can accurately describe the solute transport. So the two-region model can be used in seawater intrusion simulation. According to the numerical simulation it is also found that diffusion coefficient is enlarged with increasing in the size of soil column， and that the two-region model can be used in simulating seawater intrusion to a certain degree with some rectified parameters in the field experiments.