Yulin district is located in the transitional zone between Mu Us Desert and Loess Plateauof northern Shaanxi Province, thus it is particularly vulnerable to degradation due to its fragileecosystem and intense human activities there. The purpose of this study is to explore the mechanism,process and driving force of land degradation in area with vulnerable eco-environment within thecontext of increasing population and intensifying human economic activities, and then find out thepatterns and countermeasures of how to control them using the economic and technological ways. Indetail, this study includes three main sections: the first section analyzes the mechanism, causes andcharacteristics of land degradation, which can be achieved by the typical field investigations andsystematical analysis within the regional natural, social and economic context. Based on thetechnologies of remote sensing and GIS, and combined with the modeling methods, the secondsection reveals the change characteristics of land use and its driving force from 1990 to 2000; As tothe third section, feasible countermeasures of how to prevent the degradation and rehabilitate theregional ecology are proposed, which are studied from the perspective of harmony between natureand economy, and the conception of regional sustainable development.