Space defining of city cluster in central China

The classification of urban agglomeration in Central China mainly includes the Three urban agglomerations,the Four urban agglomerations,the Five urban agglomerations,and the Six urban agglomerations.Also,the understandings to the spatial range of each urban agglomeration have been contradicted and unclear.Thus,the scientific analysis to the spatial characteristics of central urban agglomeration will provide a basis for the rational distribution of development space of urban agglomeration,optimize spatial structure and form urban agglomeration mechanism which drives Central China.