Abstract: With Yutian Oasis of Xinjiang Autonomous Region as research area and in the view of the main driving forces effecting on regional ecological environment:land use and land cover changes(LUCC),three temporal land satellite data and related statistical information based on remote sensing technology are handled and the changing trend from 1979 to 2001 in the ecotone is quantitatively evaluated using land-cover dynamic change figure.The result shows that the main reasons are the increasing population and over-grazing,etc.Oasis desertification and degrading of ecotone groundwater level are caused by unreasonable water and soil resources utilization.At present,the vegetation cover of oasis-desert ecotone has generally declined on large scale,the original successive transitional belt has transformed into the trend of ecological gap and,as a result,the barrier function has reduced continually.In the outer frontier of oasis,the land surface is bare and loose and,as the result of sandy wind,the mobile sand has intruded farmland and deteriorated poor and fragile agriculture ecological environment.Therefore the present phase of outer oasis ecological environment is in the state of instability.