In order to understand the impact of the artificial reclamations carried out in the South China Sea Bright Pearl Project, the Huludao Island extension and the Xiuying Port expansion in recent years on the changes of scouring and silting in the Haikou Bay, the changes in tidal current field, wave field and scouring and silting before and after the reclamations in the Haikou Bay are simulated numerically based on the finite-volume coastal ocean model (FVCOM). According to the comprehensive situation of scouring and silting under various conditions, most areas of the Haikou Bay are in a silting state after the reclamations in bay due to the actions of tidal currents and wind waves. The predicted annual amount of siltation is in the range of 0.1 m to 1.0 m. Some local areas such as the Baisha headland are in an erosion state, with the predicted annual scour volume being 0.1 m to 0.3 m. Due to the influence of the artificial reclamations, the hydrodynamic condition in the channel of the Xiuying Port is weakened. This is beneficial to the improvement of navigation conditions, but it is still needed to strengthen the monitoring of water depth and the dredging regularly in the channel. In the wave shadow area on the south side of the "South Sea Pearl" Island, the sediment accumulations may cause a tonguelike protrusion forming toward the sea. At the two sides of the protrusion, an erosive and retreated belt may possibly form along the coast so that some measures such as artificial sandreplenishment will be needed in order to ensure the stability of the shoreline.