The navigable water flow conditions of the approach channel are crucial for shipping safety.To study the rectification effect of different types of separation walls,this paper relies on the Wuxi Hub second-line ship lock project to establish a fixed bed physical model.By measuring the surface flow velocity distribution,the navigational flow conditions of the ship lock is evaluated.The rectification effect of the full-solid separation wall,the combination of solid and multi-type permeable separation wall,and the row pile rectification and other schemes are systematically compared and studied.The combination scheme of row piles and pile foundation insertion plate separation wall is proposed.The results show that extending the length of separation wall can reduce the transverse and longitudinal flow velocity and improve the water flow conditions in the approach channel effectively.Reasonable arrangement of floating separation structure can meet the water flow conditions of the approach channel,and the rectification effect is better than that of full-solid separation wall.The rectification effect of pile row scheme is better.The combination scheme of pile row and pile inserted separation wall synthesizes the advantages of floating separation structure and pile row rectification technology,which can guarantee the rectification effect and reduce the project cost.