Based on a lot of statistical data, the ecological model of waterlogging field in Jianghan plain is developed in this paper,and the comprehensive effects of the buried depth of ground-water table and the seepage on the cropland ecosystem in Jianghan plain are analysed,and the ecological characteristics of waterlogging field are shown in comparison with non-waterlogging field,and the criteria of waterlogging field are suggusted with the analysis on a lot of observations.