中文摘要：

基于2010年市域数据，定量分析市域范围的城市规模分布对经济绩效的影响，并探索最优城市规模分布的影响因素。结果表明，①在控制了其它重要的生产要素后，单中心规模分布具有更高的劳动生产率；②随着规模由小变大，具有最优经济绩效的城市规模分布形式存在单中心一多中心一单中心的转变；③没有发现经济发展水平影响最优城市规模分布的明确证据；④西部地区城市规模单中心分布更有助于提高经济绩效。

英文摘要：

In 2011, the proportion of China＇s urban population exceeded 50%. The focus of China＇s urbanization is shifting from improving the urbanization rate to optimizing spatial efficiency, and it is of significant importance to explore the optimal city size distribution in terms of economic performance. City size distribution is a kind of spatial structure that reflects individuals＇ location choice after weighing their own advantages and disad- vantages, and this is bound to affect the performance of economy. However, there is no logical consistency answer on which one is more efficient, pursuing mono-centric spatial structure for higher agglomeration economy or hunting polycentric spatial structure for lower agglomeration diseconomy. Besides, research on the economic performance of city size distributions has long been neglected. Existing studies of urban size distribution are mainly concentrated in discovering the stylized facts and rules of city size distribution, validating whether the theory of city size distribution conforming to the facts, and explaining the mechanism on the for- mation of city size distribution and so on. Based on city-regions cross-sectional data in 2010, this article stud- ies how different city size distribution influences economic performance, what kinds of city size distribution has a higher economic efficiency in the mono-centric or polycentric dimension, and whether the optimal eco- nomic performance of urban size distribution is affected by other factors. This conclusions show that： 1） the mono-centric city size distribution tends to be associated with higher labor productivity, but with further sam- ples subdivision, the optimal city size distribution turns up a mono-poly-mono shift along with the rise of scale. 2） No evidence has been found to support that the level of economic development affects the optimal city size distribution. And 3） it is of great significance to shape the cities in China＇s western region into mono-centric form.