Construction design optimization is more and more widely used in the construction design of ship locks.Taking the right bank joint dam of Longxikou project as an example,considering the engineering boundary conditions comprehensively,three kinds of implementation schemes for the right bank joint dam are proposed.The best implementation plan is selected from the aspects of project quality risk,construction period and construction cost,and the characteristics of tight construction period and difficult foundation treatment of the right bank joint dam are considered.In the implementation and application,a series of optimization techniques and measures have been taken to ensure the construction period and reduce the cost to the expected effect in view of the difficulties in the construction of the right bank joint dam.