The　heat　dissipation　efficiency　of　the　radiator　is　of　great　significance　to　the　reliability　of　the　power　transformer　system.　However,　traditional　coatings　on　the　radiator　are　designed　to　improve　the　corrosion　resistance　of　radiators,　which　usually　have　a　lower　thermal　conductivity.　In　this　work,　the　thermal　properties　of　graphene-doped　coating　have　been　studied　using　a　combination　of　electrical　and　optical　method.　It　has　shown　about　a　15%　improvement　in　the　thermal　conductivity　compared　to　the　traditional　anticorrosive　coatings.　It　will　be　shown　that　the　graphene　can　not　only　spread　more　heat　to　enable　the　sample　to　reach　the　steady　state　more　quickly　but　also　enhance　the　heat　radiation　to　lower　the　temperature.　It　provides　a　simple　and　effective　way　to　accelerate　the　heat　spread　of　radiators　and　thus　lower　the　system　temperature.