Depending on Qiganzui’s reconstruction project of Huarong river in Hunan province,we combine numerical simulation with navigation ship handling simulator to research the navigation structures’ layout on the lock which locates on the concave bank of continuous narrow curved river and both the upstream and downstream approaching channels lie on the curved reach with small radius of curvature,propose the method to improve the navigational conditions,and point out matters of attention for the layout,so as to provide reference for similar projects.