The experiments on indoor imitating process of soil column leaching for desalting were conducted on heavily saline soil in seabeach. The results showed that the absolute amounts of Na⁺、Cl^-、SO₄^2-、Mg²⁺、Ca²⁺ and K⁺ decreased gradually with the decreasing of salt content while that of HCO₃^- increased. Furthermore, the relative contents of Cl^- and Na⁺ decrease slowly but those of SO₄^2-,Mg²⁺,K⁺,especially of Cat+and HCO₃^-,increased significantly. Due to the different transfer rates of ions, the soil chemical type took a shift from Cl-Na to HCO₃-Ca. The changes of salt chemical type in leaching solution happened more slowly than in the column soil. During the whole leaching process in the experiments, the pH value, HCO₃^- content and RSC went up, then went down with the shifting point of soil salt content being <1g/kg, it is quite the contrary for Ca²⁺ content in soil. Both the SAR and ESP decreased all the time and ESP almost reached zero. The real reason for pH increase during the process of desalting was not the hydralization of nonexchangeable Na⁺ but the leaching loss of Ca²⁺ and a small increase of HCO₃^-.Therefore the desalting process happened in seabeach soil would not cause alkalization.