A Study Of Lanzhou City Spatial Structure Evolution And Sustainable Development

City development is a continuous course, city space writes down the orbits of human activities and city development in a unique way. Affected by regional difference, each city has a unique development orbit and spatial structure, which relates to its social and economy development. Therefore, some representative urban space development are systematically studied, there are important theory meaning and practice meaning.Lanzhou city is regarded as a typical valley city in the northwest China, because of its special topographical condition, in addition weak development foundation and city development policies of the jumping type originally, cause the lopsided development of the industrial structure, and then influence the rational overall arrangement of city space. Therefore, the thesis takes Lanzhou city as a case study, turns space evolution into a breakthrough point, concludes the characteristics of space development and form, analyzes the influencing factors of space development, judge the space development trend in the future. Its aim lies in exhibiting the evolution course of Lanzhou city spatial structure in an all-round way in terms of urban geography, offering developmental references for Lanzhou city that is striding towards a modernized metropolis and giving some help to harmonize the city interior space development in the future.The thesis is divided into seven parts altogether. The first part is preface, on the basis of expounding the background, the purpose, the meaning and the thinking of the thesis study, briefly introduce the research achievements of domestic and international urban spatial structure; the second part is summary, expatiate on the connotation, component, research span and space type of urban spatial structure; The third part is theory foundation, mainly introduce the three classical models of city spatial structure in the west country (concentric circles mode, fan-shaped mode and multi-core mode) and the relative city development theories (growth pole theory, dot-axis theory, core-fringe theory, metropolis circle theory and city space evolution theory); The fourth part is general situations of study region; The fifth part is the analysis of Lanzhou city spatial structure evolution, along the historical venation Of city development, on the basis of analyzing industrial structure change, focus on and sumup the characteristics of spatial development and form, meanwhile, analyze factors which influences the spatial development; The sixth part is the analysis of Lanzhou city spatial development trend, put forward the development models of Lanzhou city spatial structure from three space aspects(the core city, the city, region) in the future, they are group gobbet structure, fingers structure, circle structure; The seventh part is to mainly put forward the development strategies for the different spatial structure models.