Plasma　technology　has　some　shortcomings,　Such　as　higher　energy　consumption　and　byproducts　produced　in　the　reaction　process.　However　non-thermal　plasma　associated　with　catalyst　can　resolve　these　problems.　Therefore　this　kind　of　technology　was　paied　more　and　more　attention　to　treat　waste　gas.　A　hybrid　system　comprising　a　non-thermal　plasma　reactor　and　nanometer　titanium　dioxide　catalyst　was　used　for　benzene　removal　in　the　air.　The　paper　described　the　synergistic　effect　of　ozone　and　photocatalyst　in　the　plasma　reactor.　Except　of　electric　field　strength,　humidity　and　flow　velocity,　the　synergistic　behavior　of　ozone　and　photocatalyst　was　tested.　The　removal　efficiency　of　benzene　reaches　nearly　99%　when　benzene　concentration　is　600　mg/m(3),　and　the　removal　efficiency　of　benzene　also　reaches　above　90%　when　benzene　concentration　is　1500　mg/m(3).　The　plasma　reactor　packed　with　photocatalyst　shows　a　better　selectivity　of　carbon　dioxide　than　that　without　photocatalyst.　The　final　products　is　mostly　carbon　dioxide,　water　and　a　small　quantity　of　carbon　monoxide.