The study on exchange-adsorption of aluminium and manganoustions in red soils was carried out.The results were shown:Ion exchange power (or ion adsorbability) sequence was Al³⁺>Mn²⁺>Ca²⁺>K and the amount of adsorbedtion and displacedtion increased with the amount of added ion,which acted according to the universal rules of ion exchange;Nonelectrostatic adsorption of hydrolysis products overlapping electrostatic adsorption was probably responsible for the nonequivalence of ion exchange reaction in which aluminum and manganous ions participated,it was extremely in laterite systems due to its more content of iorn oxide;The realationship between amount of nonelectrostatic adsorption and concentration of equilibrium solution conformed to the the Freundlish equation.