Polycentric Network Organization of Mega-City Regions in Yangtze River Delta

This paper investigates the polycentric network organization in Yangtze River Delta in 2001 and 2009 by morphological attribute and functional connection. The result shows that a morphological and functional polycentric network is in development in mega-city regions in Yangtze River Delta. In terms of morphological attribute, the rank-size feature of urban system has a tendency of decreasing. Meanwhile, network connection between cities in the mega-city regions in Yangtze River Delta tends to be frequent.