Aiming at the problem of suspended matter diffusion in dredging construction,we research and develop the filtration materials of the three-layers composite structure of surface fiber mesh,central substrate and bottom fiber mesh,prepare the anti-fouling screen,and test and verify the performances in the actual project.The results show that the interception rate of the filter material on suspended matter can reach 95%.Under the scouring action of water flow,it can effectively prevent clogging,restore filtration effect,and improve the service life of anti-fouling screen.Using the developed filter material as curtain of the anti-fouling screen,the suspended matter decreases from 408 mgL to 56 mgL.The filtered water quality satisfies the requirements of the third class of sea water quality standard.The developed filter material can effectively avoid the secondary pollution of construction to the surrounding environment.