To　solve　the　problem　of　anticorrosion　design　in　early　stage　of　manufacture,　a　formal　method　of　anticorrosion　design　was　proposed,　and　a　formal　model　of　conceptual　design　of　anticorrosive　materials　was　established　by　using　hierarchical　structure,　individual　color　sets　and　unified　color　sets.　Basing　on　the　reasoning　matrices　which　were　established　by　using　polychromatic　sets　theory,　a　formal　reasoning　method　was　proposed　to　realize　the　formal　reasoning　from　the　functional　requirements　to　the　selection　of　final　scheme.　This　formal　method　of　conceptual　design　for　anticorrosion　based　on　the　polychromatic　sets　can　make　the　design　process　of　anticorrosion　standardized,　and　facilitate　the　formal　description　of　the　reasoning　process　and　its　expression　and　operation　in　computer.　The　method　made　some　useful　exploration　for　the　CAPP　integration　design　of　anticorrosion.