After the installation of warning separation piers in the upstream zigzag approach channel of the Linhuaigang double track ship locks,there is the serious reflux and local exceeding of lateral flow velocity in the downstream approach channel.In response to the safety navigation issues,we conduct ship maneuvering simulation tests.The resuts show that the width and turning radius of the upstream approach channel can meet the needs of safe entry and exit of ships at the ship lock.The layout scheme of a curved and straight out zigzag approach channel is a control condition for navigation safety,and the safety margin is relatively small when two rows of 1 000-ton ships are docked in the berthing section.The length of the warning separation pier between the two gates is too long,which has a negative impact on the navigation of ships exiting the gate.The longitudinal arrangement range should not overlap with the mooring section.The width of the downstream pilot channel that does not exceed the standard can meet the safety navigation needs of ships.