Abstract: According to the specific characteristics of the Gaogang second-line shiplock and the Design Code for Filling and Emptying System of Shiplocks,the lock’s short culvert associated with sector gate gap filling and emptying system is adopted and the detailed layout has been analyzed and determined.At the same time,the valves’ opening modes are calculated.The hydraulic characteristics during lock filling and emptying are calculated through the lock filling and emptying mathematical model.The calculated results indicate that the dimensions of the filling and emptying system and the valves’ opening modes are appropriate and the hydraulic characteristics can meet the relevant requirements of the code and the design.The suggested dissipation type is suitable for the Gaogang second-line shiplock and preferable flow condition may be obtained in the lock chamber.Furthermore,the design proposal for the open-close system of the valve and the gate is put forward in the study.