The second-lane ship lock project of Xijin hydro-junction is one of the most important measures to build the “Xijiang River 100 million-ton golden waterways”.To study the influence of the inflow of the Xizhukeng River’s tributaries at the right bank of the berthing section of the second-lane ship lock’s lower approach channel on the navigation flow condition,we carry out a hydraulic model test to study the effect of energy-dissipating facilities in the tributary channel on the flow velocity and flow pattern at the inlet of the branch,and propose the engineering measures including a diagonal guide dam,baffle pier,and stilling basin,to serve as reference for similar engineering projects.