Binhai port in Yancheng is seriously back silted by sediment.The port area needs to maintain dredging of water depth all year round to maintain safe navigation depth.The high water content of dredged sediment and lots of interference factors during construction lead to that the construction efficiency is low and the maintenance cost is high.In view of the maintenance of water depth in the port area,we analyze the back silting law and the required navigation depth of the ship,combine with the water depth dynamic maintenance technology such as the application of appropriate depth for navigable,the well proposed rising of depth,and optimize the time node for maintaining dredging in the port area and the key construction parameters of cutter suction ship.It can effectively reduce the number of maintenance dredging while ensuring the safe navigation of the ship,improve dredging efficiency and reduce maintenance costs.