This　study　used　salinity　(0.5　wt%,　0.75　wt%)　to　accelerate　the　formation　of　ammonia　oxidizing　bacteria　-(AOB)enriched　aerobic　granular　sludge　in　a　lab-scale　anaerobic/micro-aerobic　simultaneous　partial　nitrification,　denitrification　and　phosphorus　removal　(SPNDPR)　reactor.　Results　confirmed　that　the　average　granule　diameter　increased　from　298.7　to　425.4　mu　m　after　45　days　of　salinity　stress　even　with　low　dissolved　oxygen.　Extracellular　polymeric　substances　increased　from　149.5　to　387.7　mg/g　VSS　after　salinity　(0.75　wt%)　treatment,　in　turn　accelerating　granulation.　Partial　nitrification　was　maintained　under　the　salinity　condition　due　to　the　relative　high　activity　and　abundance　of　AOB,　and　the　observed　nitrite　accumulation　ratio　averaged　98.9%.　Salinity　favored　glycogen-accumulating　organisms　over　polyphosphate-accumulating　organisms　(PAOs)/denitrifyingPAOs,　with　the　abundance　of　Candidatus_Competibacter　increasing　from　4.86%　to　15.34%　and　the　simultaneous　partial　nitrification-denitrification　efficiency　increasing　from　74.4%　to　91.1%,　promoting　N-removal　potential.　The　P-removal　performance　was　good　under　0.5　wt%　salinity　but　was　inhibited　under　0.75　wt%　salinity.