Nianpanshan lock is identified as Grade III，with a maximum design head of 14.2 m，belonging to a large medium-head lock. According to relevant project experience，the long-corridor filling and emptying system with side branch holes inside the lock wall is adopted. The recommended valve opening time is 6 min. The filling and emptying system and valve opening time directly affect the water flow and berthing conditions. Through the hydraulic calculation and 1:15 physical model，the hydraulic characteristics of the filling and emptying system，corridor pressure，and the berthing conditions of the lock chamber are analyzed. The results show that the adopted system is reasonable，and the hydraulic characteristic indexes under the designed valve opening mode can meet the requirements of design and codes.