At the study area of Xigu District in Lanzhou City, using RS & GIS as tools we apply Diversity, Domi nance, Fragmentation, Isolation and so on to study the quantitative, fractal and spatial characters of landscapes' struc tures in the four sub-regions divided by the morphological features. Using the Fractal Theory to establish the fractal struc ture models, we analyze the complexity and stability of various landscapes' distribution with fractal dimension value.The spatial distribution characteristics of landscape mosaic structure are also expounded. At the end of the paper we dis cuss the relevant problems on the main factors which control and effect on the spatial pattern of landscapes as well as on landscape optimization and management.