By　decreasing　the　settling　time,　aerobic　granules　enriched　with　phosphorus　accumulating　organisms　(PAOs)　were　cultivated　under　alternate　anaerobic/aerobic　conditions　in　a　SBR　inoculated　with　conventional　activated　sludge.　The　system　underwent　three　phases:　rapid　start-up　with　synthetic　wastewater　(phase　I),　stabilization　with　real　domestic　wastewater　(phase　II)　and　enrichment　of　PAOs　by　increasing　ρ(P)/ρ(COD)　(phase　III)　and　stabilized　during　352　cycles.　However,　filamentous　sludge　bulking　happened　during　start-up　phase　and　readily　biodegradable　organics　in　synthetic　wastewater　was　considered　to　be　the　main　reason　for　filamentous　overgrowth　in　aerobic　granules.　It　was　ultimately　controlled　through　changing　the　substrate　from　synthetic　wastewater　to　real　domestic　wastewater.　The　matured　aerobic　granules　had　an　approximately　spherical　shape　with　a　size　of　0.8　mm,　SVI　of　17-30　mL/g.　The　average　PO43--P　removal　efficiency　was　above　90%.　FISH　analysis　showed　that　PAOs　accounted　for　about　51.48%　of　the　total　bacteria.