The navigation environment of Yuanjiang Bridge is very complicated，and the layout of the original bridge is unreasonable，which seriously restricts the construction of the second-line lock expansion project of Taoyuan Hub.In view of the problem of poor navigable conditions in the bridge area，the layout scheme of the bridge navigable hole on the left bank is studied，using the method of combining the bed river model and small scale ship model test，and comprehensively analyzing the steering angle，drift angle and speed of the ship model test.The results show that under the same total navigation width，the double hole two-way is better than the double hole one-way.The right movement of the navigable hole of the bridge can reduce the difficulty of ships crossing the bridge downstream at the first-line lock，but it will increase the difficulty of ships crossing the bridge upstream at the second-line lock.It is suggested that the net width of the navigable hole of the new bridge on the left bank should not be less than 220 m.The bridge position should be shifted to the right by about 75 m compared to the current bridge.The navigation method should be adopted with double holes two-way and two line locks divided into slots.