The main corridor water conveyance system of unilateral lock wall has the advantages such as simple structure，small amount of excavation and less investment in the project.It has obvious technical advantages in the narrow valley，steep slope and other topographic restricted areas.However，one of the difficulties in its engineering application is how to ensure the uniformity of the flow velocity in the corridor and avoid serious drift and deflow phenomena.Based on Caojie second-line ship lock project of Jialing River，this paper uses the general CFD software FLUENT to study the hydrodynamic characteristics of the bifurcation pipe in the layout of double valve water delivery system in the main corridor of the single-side lock wall in a more detailed way，and discusses the influence of the bifurcation angle of the bifurcation pipe，pier curve type and outer wall curve type on the hydraulic characteristics of the bifurcation pipe.The layout type of bifurcated pipe in the valve section of unilateral water transmission gallery with sinusoidal curve on the outer wall and arc-straight-arc curve on the inner wall is proposed，which can provide reference for similar engineering design.