Miyun County of Beijing not only provides water resource for Beijing but also possesses a great priority

in supporting Beijing's outward expansion. However, as Miyun County is developing along with Beijing's rapid high

-tech and economic development, its eco-environment is confronted with strong pressure caused by the increase of

population as well as the social and economic activities. Using Landsat and Beijing-1 satellite images, the

authors obtained several eco-environment factors with the help of RS and GIS technologies. This paper has dealt

with the land use maps of three terms and, on the basis of land use, analyzed vegetation coverage and landscape

indexes to disclose the variation. In addition, land surface temperature was calculated from the ETM+ image of

1999. The above factors detected in 1999 and their relationships are also discussed for different ecological

regions.