With building of regulating structure in Luocheng Shoal,the flow field distribution will be changed in this area,and it can have some effect on the navigation and berthing of ships.We apply the computational fluid dynamics software to simulate the flow field distribution of the area in this paper.The results show that the regulating structure can effectively prevent the erosion of the flow on Luocheng Shoal,and make the channel more stable.However,the water velocity of Zhenjiang dangerous chemicals anchorage will obviously increased,and the anchorage is located in the left branch channel of Luocheng Shoal.Especially in flood season,adverse affect of berthing will be produced because of the changes of flow field.So it is very necessary to monitor the flow field and manage the berthing ships.