Destruction　of　indoor　air　pollutant　formaldehyde　using　dielectric　barrier　discharge　plasma　in　a　coaxial　cylindrical　reactor　was　carried　out　at　atmospheric　pressure　and　room　temperature.　Three　kinds　of　catalysts,　that　is,　TiO2,　BaTiO3,　or　TiO2　&　BaTiO3　were　tested　for　HCHO　removal.　Effect　of　catalyst　carrier,　catalysts,　and　catalyst　amount　on　specific　energy　density　(SED),　energy　yield　(EY)　and　HCHO　removal　efficiency　were　investigated.　The　by-product　was　detected　and　the　mechanism　of　HCHO　degradation　was　performed.　It　had　been　found　that　DBD　reactor　contained　TiO2　&　BaTiO3　catalysts　could　effectively　decompose　formaldehyde.　The　HCHO　conversion　of　three　kinds　of　catalyst　was　TiO2　&　BaTiO3　＞　BaTiO3　＞　TiO2.　Higher　amount　of　BaTiO3　in　TiO2　&　BaTiO3　catalysts　was　slightly　superior　to　the　smaller.　Furthermore,　TiO2　&　BaTiO3　catalyst　could　not　only　enhance　the　HCHO　removal　efficiency,　but　also　save　the　energy,　which　could　be　used　for　industrial　application.