A　sol-gel　process　was　employed　to　prepare　SiC　precursors,　using　tetraethyl　orthosilicate　(TEOS)　and　sucrose　as　raw　materials.　And　oxalic　acid,　ferric　nitrate,　and　nickel　nitrate　were　added　respectively　as　catalyst　for　hydrolysis　and　polymeration　reactions.　The　effects　of　catalyst,　reaction　temperature,　and　reaction　time　on　the　gel　formation　were　studied.　The　results　showed　that　ferric　nitrate　was　optimal　for　gel　formation.　SiC　of　133　m2·　g-1　was　obtained　by　further　carbonthermal　reduction　of　the　xerogel　from　the　sol-gel　system　involved　ferric　nitrate,　at　1350　°　in　an　Ar　flow　for　10　h.　Such　SiC　was　then　used　as　catalyst　support　for　CO　oxidation.　Wet　impregnation　method　was　adopted　to　obtain　Pt/SiC　catalyst.　The　as-prepared　Pt/SiC　catalyst　showed　good　activity　and　stability　for　CO　oxidation.　It　was　also　found　that　its　performance　could　be　improved　significantly　with　the　synergistic　action　of　Ni　promoter.　©　Editorial　office　of　Acta　Physico-Chimica　Sinica.