Trichloroethylene　is　carcinogenic　and　poorly　degraded　by　microorganisms　in　the　environment.　Advanced　Oxidation　Technology　is　considered　to　be　an　effective　treatment　technology　for　TCE　degradation.　In　this　study,　a　double　dielectric　barrier　discharge　(DDBD)　reactor　was　established　to　decompose　TCE.　The　influence　of　different　condition　parameters　on　DDBD　treatment　of　TCE　was　investigated　to　determine　the　appropriate　working　conditions.　The　chemical　composition　and　biotoxicity　of　TCE　degradation　products　were　also　investigated.　Results　showed　that　when　SIE　was　300　J　L−1,　the　removal　efficiency　could　reach　more　than　90%.　The　energy　yield　could　reach　72.99　g　kWh−1　at　low　SIE　and　gradually　decreased　with　the　increase　of　SIE.　The　k　of　the　Non-thermal　plasma　(NTP)　treatment　of　TCE　was　about　0.01　L　J−1.　DDBD　degradation　products　were　mainly　polychlorinated　organic　compounds　and　produced　more　than　373　mg　m−3　ozone.　Moreover,　a　plausible　TCE　degradation　mechanism　in　the　DDBD　reactors　was　proposed.　Lastly,　the　ecological　safety　and　biotoxicity　were　evaluated,　indicating　that　the　generation　of　chlorinated　organic　products　was　the　main　cause　of　elevated　acute　biotoxicity.　©　2023