The filling-emptying system,which is a key parameter in lock design is the core of a ship lock,and its design directly affects the lock's carrying capacity.In response to the large-scale filling-emptying,and high requirements for hydraulic indicators and conveyance efficiency of the Weishan third-line ship lock,the hydraulic characteristics,ship berthing stability conditions,and dissipation facilities of the filling-emptying system under various working conditions and layout of the filling-emptying system are studied by a physical model test with a scale of 1:30.The results indicate that the lock design is optimized technically and economically by removal of inlet grilles and the use of vortex plates at the inlet.The arrangement of energy dissipation work at the outlet and the optimization of the navigation wall shape for the downstream approach channel guidance significantly improves the water flow conditions.Under valve opening mode of optimized layout of the filling-emptying system,all hydraulic indexes can meet the requirements of the design and the codes,and the overall design of the filling-emptying system is reasonable and feasible.