Six types of oxides,i.e.Goethite (G),Manganite (M) Ad-B-G (goethite treated with borax),Ad- B-M (manganite treated with borax),Oe-B-G (goethite treated with boric acid) and Oc-B-M (manganite treated with boric acid) were used as objects in the study on Mn²⁺ adsorption characteristics of B- loaded oxides in an isothermal condit ion with the adsorption equilibrium method.The results show that in terms of Mn²⁺ adsorption capacity,the 3 minerals of the goethite series followed the order of Oe-B-G>Ad-B-G>G,and the other 3 minerals were in the same order,O-c B-M>Ad-B-M>M.Their capacity rose with the pH of the solution,which,however,differed between the two series of oxides.It was believed that oxides treated with boron increased adsorption of Mn²⁺,and Mn²⁺ was more readily adsorbed by the manganite series of oxides than the goethite series.Electronic property PZC (Point of Zero Charge) of the minerals might be the main factor caused these differences.Mn²⁺ sorption increased with the concentration of Mn²⁺ in the solution.The ratio of proton-to-manganese stoichiometry on these minerals was in the order of Oe-B-M Ad- B-G>G.The decrease in release of H⁺ into solution was due to changes in surface charge and number of active sites on the surface or the micro-particle size of oxide.These results provided strong support for the phenomenon that application of boron to acidic soil could relax acidification of the soil.