To the problems of large land acquisition area and large excavation volume caused by the use of a straight approach channel layout scheme upstream of the Linhuaigang double track ship lock,a separated approach channel layout scheme and a broken line approach channel scheme optimized for lock efficiency are proposed.To the problem of complex water flow conditions in the upstream and downstream approach channels,physical model experiments are used to optimize and verify the design scheme of the approach channels.The experiments show that the lateral water flow velocity in the original design scheme exceeds the standard,and the downstream approach channels experience severe backflow.The lateral water flow in the upstream and downstream is mainly controlled by the width of the approach channel.Expanding the width of the approach channel to 65 m can effectively improve the lateral water flow conditions.To the problem of local non-compliance with downstream water flow conditions,a ship model operation simulation test is used to verify the required navigation width.After verification,the flow rate of the Chengxi Lake drainage gate is less than 300 m3/s under the flat channel discharge water level,and when the flow rate of the Chengxi Lake drainage gate is less than 100 m3/s under the lowest navigation water level,the approach channel width that meets the standard water flow conditions is 45 m,exceeding the required navigation width for safe navigation of ships.