It is an effective way for reclamation to expand our living space and improve our living environment, but with the reclamation construction more and more, it makes land and sea environments tremendous influence and destruction in recent years. In this paper, by using the numerical simulation methods, analyze the change of tidal current field after reclamation. During construction, utilizing MIKE21 software suspended sediment concentration field mathematical model to analyze the construction of suspended sediment concentration distribution, and then to study the impact on the surrounding waters reclamation suspended sediment. It concluded: This project will result of the marine environment to some extent in the construction, but this effect is temporary, after the construction, suspended sediment concentrations in the sedimentation gradually reduced pollution will disappear.