Domestic dredging projects tend to be large-scale and refined,and the requirement of bedding planeness is higher and higher.For the 50,000-ton waterway project of Laizhou Port,we analyze the hydrodynamic performance of the ship in different wave directions when the ship- borne frame leveling device works based on a small leveling ship named “Hang Gong 301” and establishes a CFD simulation model.We also analyze the economic effects of different construction techniques adopted for the isolated shallow area and shallow concentrated areas,and carry out marine test.The results show that under the action of the leveling device,the motion amplitude response operator of the ship is generally small and the ship has high stability.It is better for the ship to pass through the independent shallow areas in two directions and to pass the shallow areas in multiple directions when the single side is stressed.In the shallow concentration area,the ship passes in S-line and multiple directions,and the spot dredging is carried out from the shallow area to the deep area.Within the construction period,about 103 tons of fuel and 112.5 tons of fresh water are saved,and the shallow sweep rate is 100%.The effect is remarkable.