Bailongtan hydropower station is located in a sharp bend channel,surrounded by dense buildings.Restricted by various factors such as river regime,terrain and surrounding buildings,the general layout conditions for ship lock renovation and expansion are complex.Multiple schemes are compared for the lock position and general layout from several aspects,including navigation conditions,impact on surrounding buildings,construction conditions and investment,to determine the optimal general layout scheme.Combined with the physical model tests,the layout scheme of reducing the bending radius of the channel and zigzag layout of berthing section is adopted to solve the problem of limited space for approach channel.Through engineering measures such as adding groyne,installing permeable walls and excavating partial channel,the navigation conditions of upstream and downstream entrance areas are effectively improved,providing reference for the ship lock renovation and expansion in curved channel and narrow spaces.