Qixingdun ship lock is an important node project of Wujiang Channel of Beijiang upward extension project.Its effective scale is 190 m×23 m×4.5 m (length×wide×water depth of threshold)，and its designed water head is 7.5 m.Combined with the general layout of the junction，according to the requirements of the code，the ship lock adopts the distributed water conveyance system with the side branch holes of the lock wall gallery.The model test of the water conveyance system shows that the water conveyance system of the ship lock in the original design scheme has some adverse hydraulic phenomena，such as the low pressure of the gallery behind the sluice valve，the continuous air-breathing vortex at the inlet，and the local high phenomenon near the outlet.Based on the comprehensive study of the layout of the whole ship lock and the water conveyance system，and combined with the hydraulic characteristics of the test，this paper proposes optimization measures such as lowering the sluice valve section of the ship lock，optimizing the layout of the inlet grid，and adjusting the baffle sill at the outlet.All the hydraulic characteristics of the optimized water conveyance system of the ship lock have reached the expected goals and requirements.