The soil of Suizhong port district general wharf project in Huludao is gravel with pebble and sand,which is characterized by large particle size,large density and large friction resistance.When dredging this kind of soil with cutter suction dredger(CSD),the construction parameters are unstable,the soil is difficult to be transported and production capacity is low. So,methods including construction data analysis,comparative optimization of different dredging layers based on the layered tri-dredging,optimization of the conveying technology,as well as installation of the flow deflector are taken to optimize the construction technology.As a result,the the construction productivity of Suizhong port district general wharf project is increased by 30%,the construction cost is reduced and the construction period is shortened.