Based on normal physical model test, we analyze the influence of the first-line ship lock navigation condition on the second-line ship lock construction of Zhuzhou navigation power junction in Xiangjiang river, the navigation conditions of first-line ship lock, changes in the original boundary conditions after the second-line ship lock construction, variation of hydraulic parameters on the first-line ship lock approach entrance area and the lower connection on the channel, as well as the adaptability between the existing training structure and the new construction. The results show that the influence of the second-line ship lock construction on the first-line ship lock navigation condition is limited, and the navigation condition of the first-line ship lock is the same as that before the new construction.