Based on the main eco environmental problems in the region of Longyangxia reservoir

we designed the structure

function and database of eco environmental information system using the methods of remote sensing integrated with GIS. At the end

the environmental detection information system in the region of Longyangxia reservoir was established. The system comprises of three subsystems: the remote sensed data processing system

the eco environmental information system and the statistics database management system. This system has multifunctions with detailed spatial and attribute database including fundamental geographic elements

eco environment

landform

remotely sensed image

statistics and landscape photo data. With it a new method for extracting environmental information from remotely sensed data is applied efficiently. The eco environment was then detected dynamically. The results show as follows:\;（1） The sand desertification land has been increased in nearly one decade and kept stable development situation;\;（2） The regions of very severe and severe water erosion are mainly distributed around the Longyangxia reservoir

which not only influences on the regional eco environment but also endangers the security of the Longyangxia reservoir;\;（3） Because the structure of land use is unitary and unreasonable

the grassland is degraded seriously

which results in the expending of desertification and the decreasing of land productivity.\;The system and the research methods could be applied to the other similar areas.