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　applied　voltage　and　AC　frequency,　respectively.　Furthermore,　the　experiment　was　focused　on　the　effect　of　gas　flow　rate　and　initial　concentration　on　the　toluene　abatement　efficiency　and　abatement　amount.　It　is　obviously　that　the　toluene　abatement　efficiency　descends　when　gas　flow　rate　and　initial　concentration　is　increased,　however　with　the　increasing　of　gas　flow　rate　and　initial　concentration,　the　toluene　abatement　amount　ascended　earlier,　and　then　began　to　descend.　Moreover　whether　voltage　or　AC　frequency　is　fixed,　gas　flow　rate　of　the　largest　abatement　amount　is　6.3　cm/s,　and　initial　concentration　of　the　largest　abatement　amount　is　2066　mg/m3.　With　the　increasing　of　the　applied　voltage,　the　toluene　energy　efficiency　descended.　Comparing　various　gas　flow　rates,　it　can　be　found　that　Energy(6.3cm/s)　Energy(10.1cm/s)　Energy(2.5cm/s).　Furthermore,　when　applied　voltage　ascended　from　10kV　to　15kV,　the　energy　efficiency　dropped　rapidly.　But　when　applied　voltage　increased　from　15kV　to　20　kV,　the　energy　efficiency　dropped　slowly.　©　2011　IEEE.