How The Agglomeration Effect Of Metropolitan Area Influenced By Political Considerations

China has become the world’s second largest economy with ever increasing economic power after more than 30 years of reform and opening-up. The process of urbanization of our country is accelerating at the same time. Between 2001 and 2014, the proportion of urban population increased from 37.66% to 54.77%, the average annual growth rate of the urbanization rate keeps above 1.3%. The rapid expansion of urban population and the quickly increase of the urbanization rate are important characters of the process of urbanization in our country. It is generally believed by agglomerate effect and radiate effect of city circle in regional economic development. There will also be important influence about the government mechanism on the city circle economic performance, and there is a large number of literature from the perspective of urban circle for the quantitative analysis. But it is not someone to the role of the government behavior in the city circle development for quantitative analysis. Jingwen Yu, Chunchao Wang (2011) is on the study of the city circle drive regional economic growth mechanism, compared to the Yangtze river city circle, the Zhu river city circle, circle of Beijing in beijing-tianjin-hebei urban failed to play its leading role of growth pole, they thinked that the political position of Beijing that national policies to prefer to Beijing, at the expense of the surrounding city economic development resources, so as to support the development of Beijing better. Based on this point of view, in order to verify the political factor as the center of the growth pole city deflection at the expense of the surrounding city economic development idea here is correct, this article selects the Nanjing metropolitan circle and the neighboring Jiangsu and Anhui provinces in 2004-2010 data, using OLS Regression Discontinuity Model, which based on the least-square method,and LWR Regression Discontinuity Model,which based on local linear regression, the research of Nanjing city circle shows the city surrounding Nanjing,which of Jiangsu province, had worse the economic development compared with the city,which of Anhui province.