Denitrifying　ammonium　oxidation　(DEAMOX)　technology　was　applied　to　improve　nitrogen　removal　from　real　low-carbon/nitrogen　domestic　wastewater　in　an　anoxic/oxic　sequencing　batch　biofilm　reactor　(A/O-SBBR)　system.　The　system　consisted　of　an　anoxic　SBBR　(An-SBBR)　and　an　oxic　nitrification　SBBR　(N-SBBR).　The　system　was　operated　in　A/O　mode　for　240　days　and　anaerobic　ammonium　oxidation　(anammox)　bacteria　were　added　into　An-SBBR　on　day　160.　Excellent　nitrification　performance　was　achieved　in　the　N-SBBR　with　the　NH4+-N　removal　efficiency　of　98.01%,　and　nitrifiers　were　enriched　with　a　proportion　of　3.44%.　DEAMOX　was　achieved　in　the　An-SBBR　with　nitrite　accumulation　and　ammonia　loss.　After　adding　anammox　bacteria,　the　total　inorganic　nitrogen　removal　efficiency　improved　from　50.78%　to　72.30%.　Thauera　and　candidatus_Brocadia　were　detected　with　the　proportions　of　13.75%　and　0.53%,　respectively,　which　were　strongly　related　to　partial　denitrification　and　anammox.