Plasma-enhanced　hydrolysis　of　urea　and　selective　catalytic　reduction　(SCR)　of　NOx　over　V2O5-MoO3/TiO2　were　studied　by　temperature-programmed　experiments　using　a　packed-bed　dielectric　barrier　discharge　reactor.　Urea　over　TiO2　and　V2O5-MoO3/TiO2　could　be　hydrolyzed　at　110-250　degrees　C　to　NH3　and　CO2　with　yields　of　79.0%-83.6%　and　83.8%-88.6%,　respectively.　The　catalyst　type　and　presence　of　O-2　in　the　carrier　gas　hardly　affected　catalytic　urea　hydrolysis　performance.　Introducing　plasma　reduced　urea　hydrolysis　temperature　over　V2O5-MoO3/TiO2,　without　changing　NH3　yield　under　O-2-free　condition　while　reducing　NH3　yield　to　lower　values　at　higher　discharge　power　under　O-2-containing　condition.　Urea　hydrolysis　and　NOx　conversion　temperatures　decreased　and　NOx　conversion　increased　after　introducing　plasma　into　the　urea-SCR　process.　The　presence　of　NO　in　the　feed　gas　hardly　affected　and　reduced　urea　hydrolysis　temperature　in　urea-SCR　and　plasma-enhanced　urea-SCR　process,　respectively.　5%　O-2　in　the　reaction　gas　favored　NOx　conversion　in　urea-SCR　regardless　of　the　presence　of　plasma.　In　the　plasma-enhanced　O-2-containing　urea-SCR　process,　N(-III)　species　(urea,　NH3　and　HNCO)　were　predominantly　consumed　in　the　conversion　of　NO,　rather　than　being　oxidized　by　oxidative　plasma　species.　Minor　slip　of　HNCO　was　observed　at　low　temperatures　during　urea　hydrolysis　and　urea-SCR　over　V2O5-MoO3/TiO2　and　low-concentration　N2O　was　detected　during　plasma-enhanced　urea　hydrolysis　and　urea-SCR　process.　The　BET　surface　area　and　TiO2　crystal　structure　of　V2O5　-MoO3/TiO2　catalyst　remained　unchanged　after　urea　hydrolysis　and　NO,　conversion　reactions　no　matter　plasma　was　introduced　or　not.　Plasma　enhanced　the　conversion　of　NOx　partially　by　enriching　the　catalyst　surface　with　adsorbed　oxygen.