| Ever since the 1950s, with the space research on regional urban gradually becoming the leading element of its social economic development, people is increasingly aware of the importance and necessity of studying on towns with a regional perspective and on regions in the town side. The North Shaanxi is one of the important cradles of Chinese civilization. From the original sites on valley terrace to the towns and villages along valleys, its space development model formed throughout history totally is promoted in a non-stop process. It also implies the precious original gene of living environment , which is of high scientific research values. However, due to the exploitation on the oil, gas, coal and other energy in recent years, its urbanization development is speeding up, which broke the steady pace of the evolution of living surroundings, changed its vessels of urban development, deteriorated the contradiction between urbanization construction and development and the valley environment. Therefore, it will have great significance to provide a model of spatial structural layout accordingly, to serve the government' s macro-control with some scientific basis for decision making, to establish a harmonious living environment, to ease the conflicts between man and nature and to optimize the space pattern, by studying on the special spatial structure layout of regional towns in North Shaanxi and analyze its size, shape, character and evolution in region aspect.The thesis will sum up the progress and practice of theory related to the urban spatial structure and layout around the world, especially focus on the evolution theory of some representative spatial structure, and the research on Loess Plateau and valley towns. Meanwhile, study deeply on the development situation of towns and summarize the spatial structure conditions of regional towns in North Shaanxi, on the base of analyzing the data of the town quantity, population distribution and the function the major cities and towns. The author will be clear about the process of forming, developing and evolving of its urban space by collecting a large number of historical documents and archaeological information, dissect the relevant laws, such as: the fluctuation, substitute and dynamic of the urban space formed by its unique valley landscape. And go deeper into major factors and mechanism, which have impact on the evolution of the regional spatial structure in North Shaanxi. Finally, but not the lest important, the paper will propose the programme on building up structure layout of the regional urban space around the issue of how to play the leading role of central towns during its region development, in order to promote the regional economic development by using of the reasonable layout. And it also put forward some corresponding optimization views and implementation suggestion on the point of its layout model. |