The reinforced concrete of gravity pier is the main body of seaport pier,the corrosion to which is serious because of its special construction,thus there is an urgent need of exploring the anti-corrosion and coating repair technology.Taking the coal pier in Rizhao port as a study case,we explore the detection & repairing technology and corresponding implementation measures for the gravity pier in Rizhao port.With proper anti-corrosive coating and by corresponding implementation measures,the coating’s adhesion reaches about 5.0 MPamm2,and the protective quality of air permeability and sorptivity are quite good.Therefore the coating system has obvious effect of corrosion-prevention to the concrete structure.