We adopt the experimental method of hydraulic overall physical model to study the navigation flow conditions of the entrance area and connecting section of the 2, 000-ton level second-line ship lock of Xinglong Hub, and the impact of the construction of the second-line ship lock on the navigation flow conditions of the first line ship lock.To eliminate the impact of the second-line ship lock construction on the first-line ship lock, we propose an optimization plan through multiple experiments to extend and raise barriers between the first-line ship lock and second-line ship lock, while adding diversion piers at the end of the first-line ship lock barriers.Then, we conduct further experimental research on the optimization plan.The results show that the navigation flow conditions of the second-line ship lock are good.However, the construction of the second-line ship lock has resulted in a significant increase in lateral flow velocity in the downstream entrance area of the first line ship lock due to the excavation and suction benefits of the downstream approach channel.The engineering measures of the optimization plan improve the flow conditions in the downstream entrance area of the first-line ship lock.After implementing the optimization plan, the maximum lateral flow velocity in the downstream entrance area of each level of flow decreased compared to that before the optimization plan, except for Q=820 m3/s.