Empirical analysis and comparative research have been made in this essay on the development scale of the cities in our country. With the analysis on scale efficiency, sustainable-development capacity and city-size distribution, we conclude that the most efficient and sustainable is those cities with population from 0.5 million to 2 million. Therefore the most important thing about city development is to improve the efficiency and sustainable-development capacity of cities under O. 5 million. Our cities still belong to subrank-size disttibu,hence, consequently, we should develop potential big cities beside towns so as to make every size cities distribute reasonably and promote the urbanization of oue country.
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