A　heated　composite　electrode　consisted　of　multi-wall　carbon　nanotube　(MWNT)　and　ionic　liquids　(ILs)　was　designed　and　fabricated.　The　non-conductive　binders　were　replaced　by　a　conductive　IL,　n-octylpyridinum　hexafluorophosphate　(OPFP).　This　heated　OPFP/MWNT　composite　electrode　was　applied　for　electrochemiluminescent　(ECL)　sensor,　and　the　performance　of　ECL　sensor　was　evaluated　by　ascorbic　acid　(AA)/lucigenin　ECL　system.　The　new　heated　electrode　combines　the　advantages　of　ILs/CNT　and　heated　electrode,　showing　high　thermal　stability　and　conductivity,　simple　heating　setups,　improved　reproducibility,　renewable　surface,　simplicity　of　fabrication　and　enhanced　sensitivity　with　detection　limit　(S/N　=　3)　of　0.01　μmol/L　for　AA.　©　2009　Elsevier　B.V.　All　rights　reserved.