Aiming at the problem of mutual influence between Zhuzhou first-lane lock and second-lane lock approach channel,we analyze the selection process of plane layout scheme and recommend the layout scheme of straight in and curved out.To counter the large velocity and recirculating zone at the end of the upstream dike,we put forward the layout measures of extending the excavation depth of the second-lane lock’s approach channel to the upstream by 60.0 m and installing pervious piers at the end of the dike.The analyzing result of the approach channel’s flow condition based on the model experiment reveals that the maximum instantaneous reverse water head (0.389 m) near the miter gate of the lower lock head of the first-lane lock is larger when the second-lane lock is discharged,exceeding the allowable value of specification (0.25 m).The improvement measures of installing locking device in the design of miter gate opening and closing system and strengthening observation during operation and management are put forward.