Abstract: With regard to the characteristics of waves,tidal currents,sediment and seabed evolution in Caofeidian sea area in Bohai Bay,a 2D sediment mathematical model under the coaction of waves and tidal currents is employed to study the development schemes.The verification of spring and neap tidal currents and sediment in winter of 2006 shows that the calculated values of tidal stages as well as flow velocities,flow directions and sediment concentration of 15 synchronous vertical lines are in good agreement with the measured ones.The deposition and erosion of the sea area in front of Caofeidian ore dock induced by suspended load under the co-action of tidal currents and waves are verified,and the calculated depths of deposition and erosion as well as their distribution are approximate to the measured ones.On such a basis,the effect of Caofeidian harbor reclamation scheme,that is,island in the front and land in the back,on hydrodynamic and sediment environment is studied,including change of flow velocities of the deep channel at the south side of Caofeidian foreland,Laolonggou and various harbor basins as well as the change of the deposition and erosion of the bed induced by the project.