Destruction　of　formaldehyde　by　means　of　NaNO2　ferro-electric　packed　bed　dielectric　barrier　discharge　plasma　in　a　coaxial　cylindrical　reactor　was　carried　out　at　atmospheric　pressure　and　room　temperature.　The　difference　among　four　kinds　of　NaNO2　ferro-electric　reactors　was　compared　in　terms　of　specific　energy　density　(SED),　energy　yield　(EY),　and　HCHO　decomposition.　In　addition,　by-products　during　the　decomposition　of　HCHO　and　destruction　mechanism　were　also　investigated.　The　removal　efficiency　of　HCHO　increased　by　means　of　NaNO2　DBD　plasma　significantly　and　enhanced　with　increasing　SED　distinctly.　More　amount　of　NaNO2　contributed　to　higher　HCHO　removal　efficiency　in　the　reactors.　Reactor　C　had　the　highest　HCHO　removal　efficiency　among　the　reactors.　As　an　important　by-product,　ozone　concentration　increased　with　higher　SED.　The　possible　main　products　in　the　outlet　effluent　were　CO,　CO2　and　H2O.　(C)　2009　Elsevier　B.V.　All　rights　reserved.