Based on the importance of hydrodynamic conditions in the study of marine engineering construction in coastal zone，the hydrodynamic environment of Zhoushan Islands is particularly complex due to its vertical and horizontal waterways and dense islands. In order to grasp the influence of regional engineering construction on the sea area，we carry out a two-dimensional numerical simulation study on the evolution process of tidal current field in Dinghai sea area of Zhoushan Archipelago based on the measured data. On this basis，we analyze the tidal current field during high tide and low tide and the distribution of scouring and silting in detail in a wharf area of Panzhi Island in Dinghai. The results show that on the whole，the tidal current pattern of the surrounding sea area is not changed greatly after the project. Only within 1 500 m around the wharf，it is mainly affected by the reverse tidal current of the wharf and the nearby shipyard，and the flow direction is reversed. The flow velocity in a small area of the project is changed by the flow resistance of the wharf. The flow velocity on the north and south sides of the wharf and the north side of Xixie Village Island shows a trend of decrease and increase respectively. Affected by local projects，the overall change area of scouring and silting is mainly concentrated in the sea area around the wharf. Among them，the silted sea area is mainly concentrated near the wharf and on the east and west sides of the shipyard. The scour area is mainly concentrated in the catchment area at the corner of Panzhi Island and Xixie Village Island.