Why?" I questioned in puzzle ment . He smiled and drew a circle on a piece of paper, then made a dot in its circumference and asked me,"Which way is the shortest to reach the symmetrical dot in the circumference from this point?""Diameter , I responded , and with this answer I suddenly realized that I was lucky enough to live a diametrical life , namely, a very smooth life . Since I exposed myself to the research in materials, I have been aspir ing to become a scientist, and God has blessed me with a diametrical life without any waste of time or life.

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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.

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