The relationship bewteen land use spatial pattern and terrain factors in Ansai county,Shaanxi province was studied.Based on the digital elevation model(DEM) and land use data,with the support of GIS software ArcGIS 9.3,the terrain data of elevation,gradient,slope aspect and land use data were overlaid.The results showed that spatial pattern of land use has a close relationship with terrain factors which influence land cover and its distribution obviously.With the rise of altitude,the area of forestland appe...