Dielectric　barrier　discharge　is　an　effective　method　for　producing　non-thermal　plasma.　To　enlarge　the　range　of　corona　and　enhance　the　ability　of　removing　volatile　organic　compounds　(VOCs),　a　new　efficient　apparatus　＇multi-string　non-thermal　plasma　reactor＇　for　gas　treatment　in　ambient　conditions　is　developed.　This　paper　tests　the　effects　of　reactor　structure,　electric　field　intensity,　frequency,　and　gas　flow　rate　on　the　decomposition　efficiency　of　toluene.　The　relationship　between　the　applied　voltage　and　the　currency　in　the　reactor　is　also　analyzed.　Experimental　results　show　that　the　reactor　structure　has　significant　effect　on　the　removal　of　VOCs.　Increasing　the　number　of　high　voltage　electrodes　can　enhance　the　removal　efficiency.　The　currency　increases　with　the　enhancement　of　the　applied　voltage.　The　removal　efficiency　of　toluene　enhances　with　increasing　electric　field　intensity,　and　lowers　with　increasing　gas　flow　rate.　The　removal　efficiency　enhances　with　higher　frequency;　however,　the　effect　of　which　is　lower　than　that　of　the　electric　field　intensity.