The main development task of the Longxikou Navigation-power Junction project is to smooth the navigation channel of the Minjiang River.Since the ship lock is the only shipping facility at this junction and an important part of this channel,the importance of the filling and emptying system as the core component of the ship lock is self-evident.In response to the large-scale filling and emptying,and high requirements for hydraulic indicators of the ship lock,we carry out the hydraulic calculation analysis and the study of a single-body physical model test on the ship lock.The results show that it is reasonable to employ the support hole filling and emptying form of the gate wall long corridor side for the filling and emptying system design of the ship lock in the Longxikou Navigation-power Junction,which meets the design specifications.The water flow conditions and valve opening method during the filling and emptying of the ship lock chamber also meet the needs of safe ship passage.