Considering　the　potential　environmental　issues　caused　by　the　Haber–Bosch　nitrogen　fixation　process,　developing　green　technology　for　nitrogen　fixation　has　become　a　heated　topic.　In　this　work,　a　modified　＇concentrated　high-intensity　electric　field＇　(CHIEF)　non-thermal　plasma　system　was　developed,　by　combining　photocatalysis　and　electrodialysis　for　the　continuous　production　of　high-concentration　nitrated　water　using　air　and　water.　The　main　system　design　factors,　including:　voltage,　duty　cycle,　gas　flow　rate,　N2/O2　ratio,　and　reactor　parameters,　show　significant　impacts　on　the　nitrogen　fixation,　and　the　composition　in　the　resulting　nitrated　water.　Under　high　voltage　in　the　CHIEF　system,　N2　and　O2　were　excited,　and　generated　various　reactive　nitrogen　and　oxygen　species,　resulting　in　the　in-situ　reaction　with　water.　These　reactions　led　to　the　formation　of　NH4+,　NO2−　and　NO3−　(ammonium,　nitrite,　and　nitrate　ions)　in　the　solution　via　a　series　of　reactions　in　the　gas　phase,　gas–liquid　interface,　and　liquid　phase.　Due　to　the　rapid　in　situ　reaction,　the　highest　nitrogen　species　yield　rate　reached　48.28 μmol/min,　which　was　much　higher　than　other　reports.　The　best　(least)　energy　consumption　was　23.5 MJ/mol　of　Nitrogen.　In　addition,　photocatalysis　mediated　by　TiO2　under　UV　exposure,　greatly　promoted　the　conversion　of　nitrite　to　nitrate,　because　of　the　generation　of　·OH　and　·O2−　species.　Furthermore,　the　electrodialysis　concentration　was　able　to　efficiently　decrease　the　conductivity　in　the　CHIEF　system,　and　enriched　the　nitrate　concentration　over　dozens　of　times.　This　enabled　the　CHIEF　system　to　continuously　achieve　high-level　nitrogen　fixation　in　an　efficient　manner.　©　2023,　The　Author(s),　under　exclusive　licence　to　Springer　Science+Business　Media,　LLC,　part　of　Springer　Nature.