Abstract: Compared with conventional pumped storage power station（PSPS）,the working medium of seawater PSPS is seawater. So two new problems arise with hydraulic machinery auxiliary system:anticorrosion and antipollution. In terms of anticorrosion,the corrosion risk from the system design is reduced first,then materials through reasonable economic and technical comparison are selected,and finally the corrosion resistance of materials through appropriate anticorrosion measures is improved. In terms of antifouling,due to the small diameter and many buried pipes of the hydraulic machinery auxiliary system,the conventional coating antifouling cannot achieve sustainable effects easily.This paper uses the antifouling technology of coast nuclear power plant for reference and adopts the antifouling scheme of electrolytic seawater. After clarifying the key points of basic anticorrosion and antifouling. According to the characteristics of each auxiliary system of hydraulic machinery,this paper finally completes a complete set of anticorrosion and antifouling scheme results.