There is the bottleneck of the high-grade waterway downstream of the Yuan River,and the problem of insufficient capacity of the first ship lock at Taoyuan Hub.It is necessary to build the second ship lock at Taoyuan Hub.We compare and optimize the design schemes of the left and right banks of the ship lock by building a 1:100 integrated fixed bed physical model,and propose a series of improvement measures for navigation flow conditions of the approach channel and the entrance area.The results show that the navigation flow of the new ship lock scheme on the left bank can basically reach a flood flow rate of once every ten years,but it is necessary to rebuild three floodgates,which has a significant impact on the main structure of the hub,the flood discharge capacity of the left branch,and the stability of the riverbed.In addition,dismantling the navigation and diversion embankments on the left side of the first ship lock will lead to a significant reduction in the navigation guarantee rate of the first ship lock.The implementation of a plan to reduce the upstream excavation depth,arrange a submerged dam in the upstream connection section,optimize the length of the diaphragm wall,and expand the width of the navigation channel for the right bank ship lock can significantly improve the navigation flow conditions of the approach channel and entrance area,making it meet navigation requirements.