Abstract: The deposition trend of the shoal in the west of Daxie Island at present and after the construction of the lock along the south shore of Jintang Channel is studied by running a tidal current physical model test and using a deposition calculation formula. The construction of the dock will reduce the ebb tide speed in the shoal reach and the discharge of ebb tide in Chuanshan Channel, so the deposition speed of the shoal will increase. The shoal will be further deposited under present conditions, and the deposition speed and amplitude will be greater after the construction of the lock.