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Urban scale research is the basis for each of the city 's economic , social , and population development strategy . The city first aggregation effective populated areas , be possible to produce based on economic , scientific and cultural aggregation efficiency . In the context of certain social and economic history , the city's population carrying capacity is limited , a high degree of aggregation of the modern urban population , in part a reflection of the city 's economic prosperity and the rise of social and cultural undertakings the other hand, it has brought a series of the problem , the urban population to the survival and development of the dilemma . The modest size of the population is the key to sustainable development of the city , while urban land size , economies of scale , and are closely linked to the size of the urban population , so study the growth mechanism of the size of the urban population and the coordinated development of countermeasures in order to give full play to the city's various function has important realistic significance . This paper summarizes the theory of a large number of domestic and foreign cities -scale studies and a series of city -scale social, economic , ecological , and analysis of the natural environment , social and economic impact of city size growth , urban planning and construction , and policy , and other factors . Typical cities in the east : the comparative analysis of the growth mechanism of the size of the cities of Beijing , Tianjin , Shanghai , and learn from , regression analysis , time series data for nearly 11 years more than twenty indicators , showed that the main factors to affect the the Xi'an urban population growth of scale covers three aspects of the economic , social and ecological environment of industrial output , the total business volume of post and telecommunications , domestic water consumption , colleges and universities in the number of school books in public libraries , as well as built-up area green coverage . Unlimited expansion of the size of the cities has brought a series of problems , in order to solve these problems , optimize the urban structure and maintain the sustainable development of cities , the coordinated development of countermeasures proposed of Xi'an city size growth and coordination from population growth , urban growth management coordination urban construction planning and coordination, urban development patterns to coordinate the four aspects of the in-depth research to provide a reference for the development of cities in the development of guidelines and policies , and to promote the growth of the effectiveness of the Xi'an city , improve the people's living standards and promote the overall coordination of the city sustainable development play an important significance .
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