To ensure the safety of yacht berthing,better berthing stability of the yacht lock is required comparing with that of the traditional lock,so the design of the yacht lock’s filling and emptying system is essential.Based on the design of yacht in the project of riverbank public environment construction in Huishan district,and focusing on the influences of lock filling and emptying system on yacht berthing by establishing the 3D unsteady flow numerical model,we carry out the simulation calculation of water time,flow distribution of top branch hole and ship force and obtain the optimization measures for the transverse corridor shape,which improves the flow distribution of top branch hole and the flow pattern of the west lock,and leads to no obvious horizontal and vertical drop in the process of filling.It provides a theoretical support for the design of the yacht dock lock’s filling and emptying system.