Study on Polarization and Diffusion Effect in Capital Cities of the Central China

Based on polarization theory, this present research uses data of the secondary and tertiary industry of five capital cities in Central China and their suburb during 1990-2005 to carry on empirical studies, which demonstrate that the regional difference does not apply with the singular inverse U model but the overlapping of multiple inverse U models. The secondary industry is in the diffusion phase while the tertiary industry the phase of resource absorption. Regional differences in capital cities near the Yangtze delta area such as Hefei, Nanchang, Changsha etc are much bigger than Zhengzhou and Taiyuan and it takes more regional gradient difference for capital cities near the Yangtze Delta Area to implement the diffusion effect or polarization effect.