The Babao double-lane ship lock is a key node project for the Beijing-Hangzhou Canal to connect the second channel of the Qiantang River.Its upstream and downstream approach channels are arranged in a shared approach channel.To ensure the safety of ships passing through the ship lock when the double-lane ship lock is operating,we measure parameters such as water flow conditions in the approach channel and ship berthing conditions through real ship tests and hydraulic observations,and analyze the navigation safety of the ship lock.The results show that the water surface in the approach channel fluctuates between -0.29 m and 0.38 m,which will not cause the ship to rub against the bottom.When the double-lane ship lock is filled and discharged at the same time,the maximum flow velocity in the approach channel is 0.44 m/s,the maximum instantaneous reverse water head at the ship lock herringbone gate is 0.143 m,and the maximum mooring force of the ship is 5.74 kN,both of which meet the code requirements.When the ship lock operates in a single line,it will not affect the entry and exit of ships on the other side of the ship lock.