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This paper introduces tile related domestic and international standards of coating systems for outer surface of steel box girder. By analyzing the advantages and disadvantages of heavy-duty coating system and metal spraying composite coating system, further test is also researched in this paper, which concludes physical characteristics and chemical properties of the whole coating system, and weatherability of the topcoat. Researches show that the anti-corrosion resistance and aging resistance of both fluorocarbon topcoat heavy-duty coatings system and metal spraying composite coating system are outstanding to satisfy the protection requirement for the outer surface of steel box girder under the severe corrosion environment.