The flow condition at downstream gate of ship lock is affected by diversion from bottom and peak of dams,which is easy to destroy the diversion effect of original river channel,and it is disadvantageous to navigation of downstream traffic area.In this paper,a new type of diversion structure,pile foundation through ventilation guide is introduced,and the water flow characteristic test and ship model test are carried out to test the engineering effect by taking Wuqiangxi hub lock as an example,with initial and optimized schemes.The experimental results show that the structure can improve the flow conditions of the downstream port,and the optimized scheme is more effective than the initial scheme in improving flow conditions in the downstream gate area of the Wuqiangxi hub,which is more conducive to ship navigation.