Supported by RS and GIS,the landscape types in the study area are charted based on the landscape classification using remote sensing images obtained in 1994 and 2003.Landscape patterns in the Chang'an River basin,apart of the water source area of the middle-route of the South-to-North Water Diversion Project,are analyzed in view of landscape patch characters,landscape diversity,and landscape fragmentation by selecting the indices of patch number,diversity,dominance,evenness,fractal dimension,and fragmentation.The analysis of the ecological landscape patterns indicates that the patch number in the basin increased obviously from 469 in 1994 to 1518 in 2003.Disturbed by human activities,landscape diversity index increased by 0.61 from 1994 to 2003,but the level of landscape diversity was low.The landscape fragmentation index in the basin increased from 1994 to 2003.Among the landscape patch types,the fragmentation index for the three landscape patch types(artificial woodland,dry land,and grassland) was high and was easily disturbed by human activities.