This　paper　investigated　domestic　sewage　with　a　low　C/N　ratio.　Mature　phosphorus　removal　granules　were　inoculated　to　cultivate　granules　with　a　simultaneous　short-cut　nitrification　and　denitrification　function.　The　characteristics　of　nitrogen　and　phosphorus　removal　of　this　process　were　analyzed.　Results　show　that　AOB　can　be　enriched　by　prolonging　the　sludge　age　for　30　days　with　an　aeration　intensity　of　5　L•(h•L)-1and　shorter　aeration　time　(140　min),　whereas　the　simultaneous　nitrification　and　denitrification　ability　could　not　be　improved.　The　nitrogen　loss　increased　at　the　aerobic　time　when　aeration　intensity　was　reduced　by　3.5　L•(h•L)-1　and　aeration　time　was　prolonged　by　200　min.　The　aeration　time　was　further　optimized　to　restrain　the　transformation　of　NO2-　to　NO3-,　and　finally　the　effluent　of　TP-1and　TN-1.　During　the　process　of　the　system　function　transformation　from　phosphorus　removal　to　nitrogen　and　phosphorus　removal,　the　phosphorus　release　decreased,　however　PAOs　still　played　a　dominant　role　(60%)　in　the　process　of　internal　carbon　storage.　Batch　experiments　showed　that　DPAOs　that　can　utilize　nitrite　as　an　electron　acceptor　accounts　for　52.43%　in　the　total　PAOS,　which　alleviated　the　pressure　of　the　carbon　source　and　improved　the　simultaneous　nitrogen　and　phosphorus　removal.　©　2020,　Science　Press.　All　right　reserved.