基于2001和2006年Landsat TM影像,通过线性混合像元分解(linear spectral unmix-ing,LSU)方法提取沈阳市三环内的植被盖度信息,结合目视解译2006年QuickBird影像得到的研究区土地利用类型图,分析了2001—2006年研究区植被盖度的动态.结果表明:2001—2006年,研究区植被盖度变化剧烈,绿化建设和由城市扩张导致的农田占用现象并存,且前者的植被增加超过后者的植被损失;研究区道路、居住区、公共设施用地、公共绿地及广场的植被盖度均有不同程度的增加(5%~9%),工业用地几乎没有变化;研究区绿化建设格局比较合理,城区内外植被盖度的两极分化现象虽依然存在,但已得到缓解;研究期间,该区主要地类植被盖度随距市中心距离而递增的顺序为公共绿地及广场(0.8%.km-1)<居住区(1.5%.km-1)<工业用地(1.7%.km-1)<公共设施用地(2.4%.km-1)<道路(2.9%.km-1);公共设施用地和道路植被盖度两极分化现象依然较严重,需加强绿化建设并严格管理. Based on the Landsat TM images of 2001 and 2006, the vegetation cover information in the third ring of Shenyang City was extracted by the linear spectral unmixing (LSU) method. Combined with the visual interpretation of the 2006 QuickBird images, Land use types, the dynamic changes of vegetation cover in the study area from 2001 to 2006 were analyzed.The results showed that the vegetation cover of the study area changed drastically from 2001 to 2006, the greening construction and the occupation of farmland caused by urban expansion coexist, and the former (5% -9%) of the vegetation coverage of roads, residential areas, public facilities, public green space and plaza in the study area, with almost no change in industrial land; research Although the pattern of afforestation in the district is reasonable, the polarization of vegetation coverage inside and outside the urban area still exists, but it has been alleviated. During the study period, the coverage of the main vegetation cover in the area increased with the distance from the city center in the order of public green space and square (0.8% .km-1)