| The city is the center of the regional development. The center city is the main center of the regional development. The central city drives the regional economy development that is realized by agglomeration function, spreading function and of innovation function. The central city has the character of rank order, that makes it not only join the division of labor in the region as the main role and play as the pioneer in the right region but also join the division of labor in the larger region as the secondary role and join in the international division to play as link in the international region. To realize the role of driving function of the central city, it is necessary to set up and breed rational city system. There are not only competition but also cooperation among central cities. They should enhance the realization of cooperation to strive for mutually beneficial situation. Metropolitan area is the senior form that the central cities elaborate the driving effect. Three big metropolitan areas have emerged in Chinese coastal areas and are leading the Chinese economy development. In thedeveloping of the central city it inclines to attaching importance to economic benefit and looking down on environmental and social benefit. The development of city and region should insist on the principle of the maximum benefit of economy, society and environment and sustainable development . Transportation speed and transportation cost are more important than space distance to influence range of center cities. So setting up developed transportation net is important guarantee that central city fully realize its driving effect. The theory of central city also tell us that in making urban development policies we should break through the mode of thinking that takes "scale " as the criterion whether a city should be developed. |