Changes of iron and manganese of soil in different deswamping stages including the changes of Si0₂/Fe₂O₃ and TiO₂/MnO molecular ratios as well as free and active iron in the soil and different fractions, i.e.,<0.002 mm, 0.002-0.005 mm, 0.005-0.01 mm, and 0.01-0.05 mm were studied comparatively. The distribution of iron and manganese in soil profile was also studied. to addition, the reducing capability of soil was also studied through submerged incubation in Laboratory. The two experimental catenas which consisted of sdvamp soil, gleyed paddy soil and periodically submergic paddy sail were collected from wetiands in Idubei and Jiangsu Provinces tespectively. The gleyed paddy soil and, periodically submergic paddy soil were derived from swamp soil. The gleyed paddy soil which was of a higher content of organic matter in gleyed horizon was found in the initial stage of soil deswamping, but the periodically submergic paddy soil with a lower content of organic matter in gleyed horizon was in the late stage of soil deswamnine.