国家发改委国土开发与地区经济研究所胡勇日前在《中国经济时报》撰文指出,城市群是在城市化的过程中逐渐形成的,是社会生产力和城市化发展到一定水平的必然结果。一般认为,城市群的发展大致经历了中小城市独立发展、大都市区发展、大都市连绵区发展等阶段,大都市连绵区 Hu Yong, director of the Institute of Land Development and Regional Economy of National Development and Reform Commission recently pointed out in the article by “China Economic Times” that urban agglomerations are gradually formed in the process of urbanization and are the inevitable result of the development of social productivity and urbanization to a certain level. Generally believed that the development of urban agglomerations generally experienced independent development of small cities, metropolitan areas, the development of metropolitan continuous zone, metropolitan area