A　platinum　coated　heated　pencil　graphite　electrode　(Pt/HPGE)　was　fabricated　and　its　properties　were　characterized　by　cyclic　voltammetry　(CV)　and　scanning　electron　microscopy　(SEM),　etc.　It　was　demonstrated　that　Pt/HPGE　had　unique　properties　such　as　cheapness,　easy　preparation,　good　reproducibility　and　sensitive　temperature　response.　The　Pt/HPGE　was　employed　to　detect　riboflavin　(RF)　sensitively　based　on　the　quenching　effect　of　RF　on　Ru(bpy)(3)(2+)/C2O42-　electrochemiluminescence　(ECL)　system.　The　limit　of　detection　was　1.　9　x　10(-10)　mol/L　(S/N=3)　at　an　electrode　temperature　of　58　degrees　C,　which　clearly　lower　than　that　at　room　temperature.　The　method　was　applied　to　the　determination　of　RF　in　vitamin　pills　with　an　average　recovery　of　102.　8%.