The research object of this paper is ecological environment sensitivity of Che'erchen river basin and the core is to study the spatial structure and function of ecological environment in the basin. Based on the characteristics of the typical arid and semi-arid basin

we extracted the middle and lower reaches from the big river basin reasonably

established eco-environmental sensitivity evaluation system and the single-factor and multi-factor comprehensive evaluation models

we combined methods of remote sensing

geographical information systems and mathematics to evaluate the ecological environment sensitivity in this basin comprehensively using remote sensing images of 1980

1995

2000 and spatial data of 1 km×1 km grid water and land resources and spatial superposition analysis module of geographic information systems software which make the ecological environment sensitive area demonstrated in space. Based on the research findings we divide this region into five major ecological function areas

such as soil and water conservation and protection area in Che'erchen River delta

sandy wind control area in the plain in the middle reaches

biodiversity conservation area in downstream plains

the region of desert

the Gobi area of the southern piedmont

based on different features and functions of the areas we put forward the development and protection measures scientifically and rationally.