Water-filling is non-uniform by long culvert with branch orifices of shiplock,which impacts the mooring conditions of the lock chamber.Hydraulic characteristics of the process of water-filling by long culvert with side branch orifices and its influence on the free-surface movement of lock chamber are studied based on the CFD model and verified by the physical model.The results show that the law of flow distribution among orifices at thebeginning is opposite to which in the later period,and the non-uniform water-filling causes long wave on the free surface of lock chamber.