In view of the selection of anti-impurity equipments in the construction debris concentration area of the cutter suction dredger，this paper studies the structural designs，applicable conditions and construction process parameters of anti-impurity equipments，carries out the detailed designs of the structure of the anti-impurity equipments according to the type，the characteristics of the distribution area，and the size of debris，and obtain the application scopes of three kinds of anti-impurity equipments through the statistics of the construction parameters and production efficiency. The results show that when the cutter suction dredger constructions in the debris concentration area，choosing a reasonable anti-impurity equipment can minimize the impact of debris on ship construction and improve the economic benefits of the project.