A　series　of　experiments　were　performed　in　a　non-equilibrium　plasma　reactor　to　remove　toluene　from　a　gaseous　influent　at　room　temperature　and　atmospheric　pressure　by　decomposition　due　to　dielectric　barrier　discharge　(DBD).　We　studied　the　decomposition　efficiency　of　toluene　and　the　output　of　ozone　under　different　electric　field　strengths,　influent　flow　rates,　influent　toluene　concentrations　and　packing　materials.　Decomposition　efficiency　of　toluene　and　output　of　ozone　increased　with　increasing　voltage　and/or　influent　flow　rate,　but　decreased　with　a　rise　in　influent　toluene　concentration.　Placing　packing　materials　in　the　plasma　reactor　improved　the　toluene　decomposition　efficiency　and　packing　materials　containing　catalysts　resulted　in　greater　enhancement　of　decomposition　efficiency.　More　ozone　was　produced　in　the　reactor　with　catalyst-containing　packings　and　high　voltages,　up　to　13　kVcm-1.　The　mechanism　of　toluene　decomposition　due　to　plasma　and　catalyst　actions　is　proposed.　Toluene　decomposition　efficiency　in　the　influent　(electric　field　strength　=　14　kVcm-1,　flow　rate　=　0.3　m3·cm-1,　toluene　concentration　=　600　mgL-1)　was　up　to　95%　in　the　plasma　with　catalyst-containing　packing　material.