Abstract: Reclaimed land from a lake area is a kind of human disturbance that has emerged in large numbers since the late 1950s in China. In order to understand the characteristics of soil water soluble organic carbon (WSOC) in the reclaiming land from lake under different land uses in the Xiaodian Lake area, the concentrations and seasonal dynamics of WSOC in the 0—40 cm soil layer were analyzed. The results showed that the effects of land uses on WSOC concentrations were significant. The concentrations of WSOC under cropland were lower than those in forests at 0—10 cm deep of soil layer, and the concentrations under coniferous forest were higher than those in broadleaf forest. At 10—20 cm and 20—40 cm deep of soil layer the WSOC concentrations under cropland were higher than those in forests, and the concentrations under coniferous forest were lower than those in broadleaf forest. The concentrations of WSOC under each forest land decreased sharply with increasing soil depth. Except for December, the vertical change of WSOC concentrations in cropland soil was different from forests: the highest concentrations were at 10—20 cm depth while the lowest were at 0—10 cm depth.Seasonal dynamics of WSOC under each land use were significantly.The concentrations of WSOC in autumn and winter were higher than those in spring and summer, generally.WSOC concentrations in the impoldering land were higher relative to the upland of the same climate zone and lower compared with other wetland, indicating that the stability of WSOC in the impoldering land was lower than that in the upland and higher than that in the wetland with the alternation of wettingdrying.Thus it is important to note the effect of reclaiming land from a lake on the carbon cycle in terms of global climate change.