The Shanghai harbor plays an important role in the economic development of the city and the Yangtze river delta, even to the river basin and the coastal zone of the country. As a harbor in an international metropolis, it could bring about the change to the Asian-Pacific and the global shipping setup. It is the need of era development to expound and prove the development of the Hengsha district in the Yangtze estuary. The natural condition of the Hengsha district would support to the future utilization with artificial projects. The mudflat could become land by the induced siltation and enclosure. The new land will resolve the lack of the land and port resources in Shanghai, and establish a new estuarine deepwater harbor and a new city district. The program will also affect China's historic task for comprehensively building itself into a great naval power. The construction of the new marine city, deepwater harbor and marine equipment base is a huge and complicated systematic engineering. Before carrying out the detailed analysis reports on the natural condition, the economic feasibility and the project feasibility, we need an authoritative top design.