The logistics park with comprehensive function is planned to be constructed in the north of Yangshan deepwater port, which will result in the change of tidal current and sediment motion due to land reclamation. Based on methods of unstructured grid and dynamic stability margin (DSM), a planar 2D model is built up to imitate the tidal-field's change and analyze the change of tidal current and sediment range in the construction area, so as to solve the technical problems concerning the tidal current and sediment and demonstrate feasibility of the project.