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The adsorption characteristics of ammonium ion in saturated silty and sandy loam were studied by means of dynamic soil column experiments．The migration of ammonium ion in soil was modelled with a combined equilibrium and kinetic adsorption model(Cameron’S model)．The results indicated that the longitudinal dispersion coefficients(D)in silty sand and sandy loam were 0．175 cm2/min and 0．093 cm2/min,respectively．The dynamic adsorption capacity of silty sand was 0．156 mg/g and 0．400 mg/g when ammonium ion in water were 13．7 mg/L and 41．0 mg/L respectively；the dynamic adsorption capacity of sandy loam was 1．33 mg/g when concentration of ammonium ion in influent was 51．0mg/L．
