The lock of Shushan Pump Station plays an important role in navigation of Yangtze-to-Huai water diversion project,which is one of the controlling projects to keep smooth navigation from the Yangtze River to the Huai River.The lock has typical characteristics such as large chamber,high lift and huge flow energy,so the hydraulic problem becomes a key part in lock design.Considering the geology and structure design,the lock tends to be used the simplest dispersed filling and emptying system,the wall-culvert side-port type.It needs to be detailed studied that if the safety of vessels and lock itself during filling and emptying can satisfy the design demands.The ship berthing condition in lock chamber,the hydrodynamic characteristics and flow conditions in approach channels are all studied by a 1:25 scaled physical model.The results indicate that,all the key parameters can satisfy the needs of codes and design under the recommended lock layout and valve opening patterns.