Theexperimentwascarriedoutinacylindricaldielectricbarrierdischarge(DBD)reactorassistedwithacatalysttodecomposetolueneunderdifferenthumidity.Inordertoexplorethesynergisticeffectonremovingtolueneinthecatalysis-DBDreactor,thispaperinvestigatedthedecompositionefficiencyandtheenergyconsumptioninthecatalysis-DBDandthenon-catalystDBDreactorsunderdifferenthumidity.Theresultsshowedthatthecatalysis-DBDreactorhadabetterperformancethanthenon-catalysisoneatthehumidityratioof0.4%,andtheremovalefficiencyoftoluenecouldreach88.6%inthecatalysis-DBDreactor,whileitwasonly59.9%inthenon-catalyticreactor.However,therewasnosignificantdifferenceintheremovalefficiencyoftoluenebetweenthetworeactorswhenthehumiditieswere1.2%and2.4%.Additionally,thedegradationproductswerealsoanalyzedinordertogainabetterunderstandingofthemechanismofdecomposingtolueneinacatalysis-DBDreactor.