The present paper deals with the adsorption and desorption of fluoride by two soils (latosol and yellow brown earth) and two synthetic iron oxides (amorphous iron ozide and goethite) in NaF solutions.On the basis of the characteristics of adsorption isotherms,Langnuir equation (C/X=1/a·X_m+C/X_m) fits best for the experimental data of Latosol and amorphous iron ozide,but Freundlich equation fits best for those of yellow brown earth and goethite.The amount of fluoride desorbed is lower than that of the fluoride adsorbed.It is possible that part of the fluoride adsorbed by electrostatic force was removed due to washing with water and alcohol.