In the early stage of the construction of a port, the steel piles in the unprotected phase I wharf were seriously corroded and rusted. With the support of the national support plan, the demonstration project of multi-layer mineral grease coating anticorrosion was carried out on 4 steel piles in the first phase of its wharf. The return visit found that the protection effect was very good, and the strength and color of the anticorrosion cover did not change.