It　is　necessary　to　remove　toluene　due　to　its　doing　harm　to　people＇s　health　in　its　wide　use.　Dielectric　barrier　discharge　(DBD)　produces　non-thermal　plasma　to　remove　toluene　using　high　frequency　alternating　current　(AC).　Based　on　the　elements　of　circuit　and　DBD,　the　effects　of　reactor　structure,　voltage,　frequency　and　power　on　removal　efficiency　of　toluene　were　tested.　The　byproducts　and　decomposition　mechanism　of　toluene　were　analyzed.　The　experimental　results　show　the　99-ceramic　reactor　of　DBD　is　helpful　for　toluene　removal　than　the　quartz　glass　reactor.　The　frequency　and　power　are　nonlinearly　related　with　the　removal　efficiency.　If　harmonic　frequency　occurs,　the　highest　power　belongs　to　reactor,　and　removal　efficiency　reaches　its　maximum　value.　The　byproducts　include　aldehyde,　alcohols,　amide,　and　benzene　detected　by　GC-MS.