Shulanghu Island is located in the offshore of Hangzhou Bay. The coastline topography is intricate and the wave and current hydrodynamic conditions are complicated. In order to study the conditions for deepwater port construction，we use the field data，nautical charts and remote sensing satellite data around the island to analyze the characteristics of the hydrodynamic environment and beach evolution. Based on that，mathematical model of wave transformation in the nearshore region and 2-D tidal current and sediment mathematical model are applied to calculate wave fields and tidal flow fields in the area，as well as the design wave factor，flow conditions and sediment deposition of the planning scheme. Based on the characteristics of the hydrodynamic and sediment environment in the area，we analyze and summarize the general layout of the scheme and the conditions of harbor construction in different bank sections from the viewpoint of hydrodynamic and sediment conditions. The conclusion can provide the basis and technical support for the determination and further study of the planning scheme，and also provide a reference for the layout of wharf schemes under similar complex coastline topography and dynamic environment.