The Freundlich adsorption eqmtion (x=kc^1/0)was developed based on the interaction between solute (or adsorbate), solven and adsorbent surface. x is the adsorption capacity, C the concentrarion of equilibrium solition, and k the characteristic parameter, as a measurement of the capacity of adsorption, which is pr oportional to the equilibrium constant of Zn adsorption. α is related to the ratio of the solvent moleculae released from solute and adsorben surface and could be considered as a measurement of the intensity of adsorption force. The welues of k and α calculated were used satisfactorily to explain the mechanism and movement of Zn added in calcareous soil.