Abatement　of　gaseous　toluene　via　alterable　frequency　dielectric　barrier　discharge　(DBD)　plasma　in　a　coaxial　cylindrical　reactor　was　carried　out　at　atmospheric　pressure　and　room　temperature.　During　plasma　processing　to　decompose　toluene,　discharge　power　was　analyzed　by　using　the　Q-V　Lissajous　diagram.　It　suggested　that,　the　specific　energy　density　(SED)　increased　with　the　increasing　of　electric　field　intensity　and　AC　frequency,　respectively.　Furthermore,　the　abatement　efficiency　had　the　similar　trend　with　SED　as　the　functions　of　electric　field　intensity　and　AC　frequency,　respectively.　In　addition,　the　trend　of　the　energy　efficiency　was　opposite.　It　declined　with　the　enhancement　of　electric　field　intensity　and　AC　frequency.　However,　low　energy　efficiency　doesn＇t　mean　low　abatement　efficiency.　With　the　augment　of　input　energy,　the　abatement　efficiency　and　the　abatement　amount　ascended　correspondingly.　Take　the　result　of　13.8kV/cm　for　example,　when　frequency　increased　from　50Hz　to　300Hz,　the　energy　efficiency　dropped　from　12.6g/kWh　to　2.6g/kWh,　whereas　the　abatement　amount　ascended　from　1294mg/m3　to　1766mg/m3,　and　the　abatement　efficiency　enhanced　from　64.7%　to　88.3%.　So　it　could　help　to　And　optimizing　parameters　to　remove　toluene　on　condition　of　relatively　reasonable　low　energy　consuming.　©　2010　IEEE.