Improved curve Northam theory was used to classify the urbanization levels of five national urban agglomerations in China along their urbanization development track. The results showed that the Yangtze River Delta and the Pearl River Delta urban agglomerations are of a higher urbanization level and have entered into the maturity and quality improvement stage

and the Beijing-Tianjin-Hebei urban agglomeration shows internal difference and large development space. The Chengdu-Chongqing and the middle Yangtze River urban agglomerations show great potential in urbanization development even though they started urbanizing relatively late. Five national urban agglomerations faces such problems as falsely high urbanization rate

difficulties for floating population to become urban residents

mismatch between the level of urban agglomeration and economic status and lack of basic public infrastructure and facilities. The urbanization development approach under the newtype urbanization framework in the future is one keeping ecological civilization concept throughout the whole process of new urbanization construction

adhering to industry development drive

coordinated development of new type of urbanization and modernization

scale and extensive urbanization transition to intensive development of new urbanization.