Sponge city is a new generation of urban rainwater and flood management concept, which means that a city can be as flexible as a sponge in adapting to environmental changes and responding to natural disasters brought about by rainwater. The international general term is "low impact development rainwater system construction". When it rains, it absorbs, stores, seeps and purifies water, and releases and uses the stored water when necessary to achieve free migration of rainwater in the city. In the new situation, the sponge city is an innovative expression of promoting the construction of green buildings, the development of low-carbon cities, and the formation of smart cities. It is an organic combination of modern green new technologies and social, environmental, cultural and other factors under the background of new era characteristics.