The soil column leaching method was adopted to study effects of application of desulphurisation products on chemical indices(exchangeable Na+,ESP,SAR and pH)of alkaline soil when they were used as amendment to ameliorate sodic soil.Two kinds of alkaline soils,strongly alkalized soil and alkaline soil,were tested in this experiment,with four levels of desul-phurisation products,3 g kg^-1 and 3.6 g kg^-1 for the former and 7 g kg^-1 and 8.4 g kg^-1 for the latter.The results show that exchangeable Na+,ESP,SAR and pH decreased significantly after desulphurisation products were applied and the soils were leached in all the treatments,and the soils were improved.The effects of high rates of desulphurisation products were much better than of the low rates.After 3.6 g kg^-1 and 8.4 g kg^-1 of desulphurisation products were applied,respectively,in the 0~40 cm surface layer of the strongly alkalized soil and 0~20 cm surface layer of the alkaline soil the chemical indices were all reduced to ESP<15,SAR<13 and pH<8.5,the criteria for moderately alkalized soils.