Abstract:In order to treat and improve the water ecology and environment in the Eco-Green Demonstration Area of the Yangtze River Delta, taking the Shanghai region as an example, this paper analyzed the current status of water resources and water environment, and put forward the idea of system treatment and watershed treatment. Based on the spatial system coordinating the land area, waterfront, water body and info-system, the five treatment measures including rainwater and sewage source management, eco-clean small watersheds and river network ecological restoration, clean water source and water supply network interconnection, flood control and hydrodynamic improvement, smart water management system are established for the purpose of reaching near-and-long term goals of comprehensive management of the water ecology and environment. Analysis result of water quantity and water quality model for river network reveals that the rivers and lakes at the provincial boundary are the natural environmental barriers. It is suggested that upstream water quality should be improved before using water resource dispatching mode, and factors such as historical reasons, practical feasibility and landscape effect should be considered for the location and standard of waterfront ecological restoration.