Abstract: Guigang navigation project is located in the Yujiang River reach of the Xijiang River,which is 6.5 km away upstream of Guigang city.The effective scale of ship lock design is 280 m×34 m×5.6m(length×width×doorsill water depth),and the filling-emptying system adopts the long gallery manifold dispersion form.The design water head is 14.1m.Through observation of the hydraulic characteristics of the filling-emptying system,gallery pressure,flow state at the exit and entrance of upstream and downstream,gate chamber,and ships’ mooring force,we have proposed a reasonable arrangement scheme of upper lock head gallery elevation behind valve,and three open ditches energy dissipation in the gate chamber.And we put an end to the overhaul shaft aeration in the process of water filling,make the distribution of transverse water flow uniform further,and make the berth stability of the designed fleet satisfy the standards.The research results show that the lock’s long gallery manifold dispersion filling-emptying form is feasible.