The Yangtze River delta urban agglomeration of China has experienced a significant development bloom in the last 30 years. To explore the spatial structure, a series of methods have been applied in this study: a mathematical analysis to ascertain the framework of cities in this urban agglomeration, a research on the expansion of completed areas, and population density on the basis of the grid analysis. It has been identified that a single-nucleus and several-centers model could be the best model to suit the spatial structure. This model, similar in many classical cases of spatial-structure model of conurbations and urban agglomerations, can be utilized to speed up urbanization, provide reasonable modes to industry spreading, establish special functional cores, and protect the environment in both urban and rural regions.

Urban Renewal plays an important role in urban economic development and urban construction in China. A large number of cities are currently developing towards high-rise and high-density models which will affect microclimate. Firstly, it analysed the impact on urban wind and thermal environment during the removal and reconstruction of residential buildings using ENVI-met. Secondly, the correlation between wind and the thermal environment with building arrangement, building density, building height and green ratio in 7 ideal cases were studied. Thirdly, the Physiologically Equivalent Temperature (PET) index was simulated by RayMan to assess thermal sensation. Finally, a case study of Changsha was simulated, where a factory was reconstructed to residential buildings. The results showed that 1) The redeveloped site will affect the neighbour outdoor thermal comfort within the range of 100m, and the impact will be insignificant beyond 100m. 2) During the daytime, higher building height and building density can result in 0.05°C-0.13°C lower PET value. 3) Green space is more effective than the residential area in cooling at night during the summer.