In order to solve the problem that the navigation wall needs to be added or extended due to the synchronous berthing mode to improve the operation efficiency of the in-service ship locks,we introduce the structure and construction scheme of two additional navigation walls in the in-service ship locks.Taking Gezhouba No.2 ship lock and Three Gorges ship lock as examples,we elaborate the construction process of in-service ship locks with the two navigation wall structures.The results show that compared with the traditional navigation wall structure and construction method,in-service ship locks with the two navigation walls can meet the operation requirements,and effectively reduce the construction period without affecting the navigation of ships during the construction period,and provide structural and construction scheme options with less impact on their own operation for most in-service ship locks.