The effect of applying lime and gypsum on element leaching in red soil derived from Quaternary red clay was studied with soil columns repacked in laboratory.Results showed that lime application decreased the leaching from the short columns (0-10cm layer) of canons exclude Ca²⁺,but increased the leaching of SO₄^2- and HCO₃^-.Supplying gypsum increased the leaching, from topsoil column of all cations,especially of Al³⁺,but has no effect on the leaching of HCO₃.Ca²⁺ leached mainly in the form of free ion, and the percentage of SO bound Ca²⁺ rose when adding gypsum. For the leaching of A1³⁺ from the long column(0-30 cm layer), it was mainly in the form of free ion.For the leaching of Al>³⁺ from the topsoil column, it was mainly in the form of OH^- bound Al>³⁺ in lime treated soil;however,the main form was SO₄^2- bound Al in the early stage and free ion in the later stage in gypsum treated soil. Besides that the percentage of OH^- bound Al>³⁺ enhanced in the topsoil solution in all lime-addition soils, that of SO₄^2- bound Al>³⁺ increased in all subsoil solution and in topsoil solution in gypsum treated soils.