A two-dimensional hydrodynamic model of Caofeidian area is developed by ADI.According to the test model，we get the tidal characteristics of Caifeidian sea area before and after the reclamation project，and analyze the influence degree of the project.The results show that the reclamation project of Caofeidian industry zone has a major impact on Caofeidian water，Laolonggou tidal inlet and Caofeidian harbor.