Photocatalytic　materials-microbial　biohybrid　systems　pave　the　way　for　solar-driven　wastewater　nitrogen　removal.　In　this　study,　interspecies　cooperation　in　photogenerated　electron　transfer　and　efficient　nitrogen　removal　mechanism　in　the　g-C　3　N　4　-anammox　consortia　biohybrid　system　were　first　deciphered.　The　results　indicated　that　the　essential　extracellular　electron　carriers　(cytochrome　c　and　flavin)　for　anammox　genomes　were　provided　by　associated　bacteria　(BACT3　and　CHLO2).　This　cooperation,　regulated　by　the　ArcAB　system　and　electron　transfer　flavoprotein,　made　anammox　bacteria　the　primary　photogenerated　electron　sink.　Furthermore,　an　efficient　photogenerated　electron　harness　was　used　to　construct　a　reductive　glycine　pathway　(rGlyP)　in　anammox　bacteria　inventively,　which　coexisted　with　the　Wood　-　Ljungdahl　pathway　(WLP),　constituting　a　dualpathway　carbon　fixation　model,　rGlyP-WLP.　Carbon　fixation　products　efficiently　contributed　to　the　tricarboxylic　acid　cycle,　while　inhibiting　electron　diversion　in　anabolism.　Photogenerated　electrons　were　targeted　channeled　into　nitrogen　metabolism-available　electron　carriers,　enhancing　anammox　and　dissimilatory　nitrate　reduction　to　ammonium　(DNRA)　processes.　Moreover,　ammonia　assimilation　by　the　glycine　cleavage　system　in　rGlyP　established　an　alternative　ammonia　removal　route.　Ultimately,　multi-pathway　nitrogen　removal　involving　anammox,　DNRA,　and　rGlyP　achieved　100　%　ammonia　removal　and　94.25　%　total　nitrogen　removal　efficiency.　This　study　has　expanded　understanding　of　anammox　metabolic　diversity,　enhancing　its　potential　application　in　carbon-neutral　wastewater　treatment.