curvilinear coordinate was developed and the engineering sedimentation method was used to study the possible impact of the coastal reclamation project of Mazucheng in the Meizhou Bay upon the tidal motion and the sediment siltation intensity in the vicinal sea area. The momentum equations were rewritten in the Lagrangian form and the convection term in the momentum equations was discretised by the Eulerian-Lagrangian method instead of the explicit upwind finite differences. The improved Double-Sweep-Implicit method was used to improve the computational stability and accuracy. Three comparative cases were studied on the basis of the satisfactory model verifications with field data. Computations show that the maximum change of tidal discharge would be smaller than 0.8% of that of the whole Meizhou Bay, indicating that the change of the situation of shoals and channels in the Meizhou Bay would be small. Based on numerical computations an optimum layout of the coastal reclamation project was recommended. For the recommended scheme, comparisons of the velocity field before and after the project revealed that there were a bit of changes in the vicinity of the project; the annual siltation intensity was smaller than 0.08m nearby the project site while that was smaller than 0.003m at the locations of main harbours and the navigation channel.