In the coast recovery and renovating project of Haizhou Bay Rizhao Port North District port shoreline，it is proposed to use the dredging engineering ship to form a golden coast，with a beach area of 449，700 m2.Considering that during the dredging construction，pollutants contained in the sea sand will spread in the seawater and thus will pollute the marine environment，we predict the diffusion of pollutants during the filling process.Adopting the computational fluid dynamics (CFD) method，we carry out the numerical simulation on the trend of pollutant diffusion in the coastal dredging construction，analyze the diffusion of pollutants，and evaluate the risk of marine environmental pollution by the construction scheme.According to the trend of pollutant diffusion and analysis results，we propose suggestions for anti-fouling screen layout scheme.Practice proves that the anti-fouling screen can prevent the spread of pollutants when applying to the dredger filling engineering.