The utilization of underwater mold bag concrete is prevalent in the construction of the Pinglu Canal project.The leakage of cement slurry will have serious impacts on the environment and ecology.Anti-fouling curtains are commonly used in engineering to block the diffusion of pollutants.However,there is relatively little research on the diffusion dynamics and effectiveness of such barriers.Therefore,this study employs Fluent software to establish a three-dimensional computation model to simulate the barrier effect of floating anti-fouling curtains on cement slurry pollutants,analyze the influence of different anti-fouling curtain arrangements and parameters on the anti-fouling effect,and determine the range of influence.The research results indicate that optimal pollutant control effect is achieved when the underwater inclination angle is 30°,the angle with the longitudinal section of the river is 20°,the distance between the anti fouling curtain and the pollution source is 2 m,and the underwater depth of the anti-fouling curtain is 4 m.The research can provide an optimized scheme for the specific layout of anti-fouling curtains in underwater mold bag construction,so as to achieve the best control of cement slurry pollution diffusion.