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The research about the expansion of urban space is an important theoretical support for which can guide the rational, the orderly and the healthy development of the city. At the present, China has entered a period of rapid economic development.The rapid urbanization brought such as population expanded、the urban construction land increased, and the increasing demand for housing, transportation, the public facilities and many other issues, this directly led to the continuous expansion of urban space.At the same time, the continuous expansion of urban space also contributed to the evolution of urban spatial morphology occurred, also contributed to urban internal spatial structure of continuous restructuring.Currently, the Loess Plateau Valley towns generally face the contradiction between the needs of urban space and the limited land to expand. Therefore, the current thesis the lack of status about the Valley Loess Plateau region of urban expansion of urban space, Selected the Yan’an City as the research object, In explaining the research background and analysis of the meaning of spatial growth boundary, It has made a detailed analysis about the development of Yan’an City in recent years, Especially give more complete analysis for the modern form of the evolution of downtown Yan’an, and efforts to find and summarize the characteristics of urban expansion downtown and power mechanisms for the Central City Region of Yan’an. Then, the paper combines the main factors of the expansion of space for the Central City Region of Yan’an. From the natural and geographical factors, social factors and economic development factors are analyzed, Determine the spatial growth of the Central City Region of Yan’an delimitation principles to be followed. And on this basis, Downtown land for the construction of Yan’an suitability evaluation, Status, and major built-up areas through infrastructure in urban growth boundary amendment space after, Comprehensive determine the spatial growth of downtown Yan’an border.Finally, the article makes some suggestions of measures on downtown Yan’an to play the role of growth boundary of space. And the innovation of this paper may be summarized, The lack of paper and the need to further study the contents were also considered.
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