In response to the problems of poor water exchange capacity in Qianhai Bay，serious surface substrate pollution，large muddy shores exposed at low tide，and near-shore waters inferior to Class IV seawater standards，which seriously affect the surrounding environment and the landscape of Qianhai，we probe into the hydrodynamic force，sediment erosion and deposition，water exchange，water environment capacity，polluted dredged soil treatment and resource utilization，etc. and propose an ecological and environmental protection remediation scheme. The implementation of the project improved the water environment of the bay area，protected and restored the marine ecology，and may serve as reference for river and lake bay management and channel dredging projects.