By selecting remote sensing image data from 1987 to 2009, the land cover types in Dongting Lake area were obtained. Through comparing the data and according to factors of hydrological and geographical location, the results showed that: the overall wetland in Dongting Lake area indicates a degradation trend, the forest area increased 24 481 hm2; the east, west and south Dongting Lake show different trends in wetland degradation. The overall area of the west Dongting Lake wetland reduced up to 9 434.3 hm2, next was the south, the last was the east Dongting Lake.%选取1987～2009年4期遥感影像数据,获取洞庭湖区地面覆盖类型,对比4期数据并根据水文与地理位置等因素对湖区进行对比分析,结果表明:洞庭湖湖区湿地总体呈退化趋势,林地面积增加24 481 hm2；东洞庭湖、西洞庭湖、南洞庭湖三者在湿地退化上表现出不同的趋势,其中西洞庭湿地总体面积减少最多为9 434.3 hm2,南洞庭湖次之,东洞庭湖最小.
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