Intermittent　hydroxylamine　(NH　2　OH)　dosing　strategy　was　applied　to　enhance　the　stability　of　partial　nitrification　and　total　nitrogen　(N)　removal　efficiency　(TNRE)　in　a　continuous　-flow　process.　The　results　showed　2　mg/L　of　NH　2　OH　dosing　(once　every　6　h)　could　maintain　stably　partial　nitrification　with　nitrite　accumulation　rate　(NAR)　of　91.6　%　and　TNRE　of　92.6　%.　The　typical　cycle　suggested　NH　2　OH　dosing　could　promote　simultaneous　nitrification　-denitrification　(SND)　and　endogenous　denitrification　(END)　while　inhibit　exogenous　denitrification　(EXD).　Nitrification　characteristics　indicated　the　NH　2　OH　dosing　enhanced　stability　of　partial　nitrification　by　suppressing　specific　nitrite　oxidation　rate　(SNOR),　Nitrospira　and　nitrite　oxidoreductase　enzyme　(Nxr).　The　microbial　community　suggested　the　aerobic　denitrfiers,　denitrifying　glycogen　accumulating　organisms　(DGAOs)　and　traditional　denitrfiers　were　the　potential　contributor　for　advanced　N　removal.　Moreover,　NH　2　OH　dosage　was　positively　associated　with　NAR,　SND　and　END.　Overall,　this　study　offers　a　feasible　strategy　to　maintain　sustainably　partial　nitrification　that　has　great　application　potential.