Abstract:Since the implementation of sponge city construction in China, the pilot projects have been completed in 30 cities in two batches, and three batches of 60 demonstration cities for systematic and comprehensive promotion of sponge city construction have been launched successively. Sponge cities have been gradually integrated into urban construction. Parks, green spaces and water systems play a crucial role as important sponge bodies in cities. Hengqin is a typical island area. Combined with the local features, through the integrated design of parks, flood discharge channels, water gates and wetlands in residential areas, the ecological functions of park green spaces, water systems and wetlands are fully utilized to build a sponge ecological foundation of Hengqin International Residential Area. Four major functions of rainwater and flood management, ecological restoration, water quality improvement and rainwater reuse are realized. The development of Hengqin into a "demonstration area" and "international leisure tourism island" where people and nature coexist in harmony with mountains, fields and water veins is accelerated, which provides a demonstration for the construction of sponge cities in other regions.