Abstract: This paper is completed mainly using the method of remote sensing images interpretation and combining with the method of field investigation and species test. After giving the conception and connotation of ecological environment in Northwest China according to the principle and purpose of the appraisal indexes selected, a all sided integrated demarcation is made through reiteration running-in the division from up to down and the mergence from down to up on the basis of classification of ecological environment in Northwest China. Finally, this makes a proposal for protection and building measure of ecological environment in Northwest China. These results provide scientific basis for monitoring, harnessing, construction and planning of ecological environment in Northwest China.

Key words: Integrated demarcation of ecological environment, Northwest China, Scheme of Integrated demarcation