To　initiate　the　domestic　sewage　aerobic　granular　sludge　(AGS)　process,　the　experiment　is　operated　by　intermittent　influent-effluent　aeration　to　reduce　the　concentration　of　nitrate　and　the　inhibition　of　PAO,　and　realize　granulation　by　phosphate　precipitation　and　positive　electricity　particles　generated　during　phosphorus　removal.　The　sludge　from　a　sewage　treatment　plant　is　inoculated　into　the　SBR　reactors　R1,　R2,　R3,　and　R4,　for　durations　of　30,　60,　90,　and　120　min　total　anaerobic　time.　This　was　used　to　study　the　effect　of　anaerobic　time　on　the　aerobic　granular　sludge　system　in　domestic　sewage.　The　experiment　shows　that　reactors　R1,　R2,　R3,　and　R4　are　started　successfully　with　56,　48,　39,　and　35　days,　respectively.　After　105　days　of　the　operation,　the　respective　average　particle　sizes　reached　750,　764,　791,　and　650　μm.　During　the　operational　period,　at　the　43rd　and　47th　day,　phosphorus　removal　performance　deteriorated　in　R1　and　R2,　and　it　recovered　after　the　anaerobic　time　was　extended　to　90　min.　The　effect　of　nitrogen　and　phosphorus　removal　in　R3　is　good;　at　the　63-77　day　the　granular　sludge　in　R4　disintegrates,　and　the　effect　of　nitrogen　and　phosphorus　removal　and　DPAO　enrichment　is　decreased.　During　the　later　stage　of　operation,　the　effluent　in　R1,　R2,　R3,　and　R4　reaches　the　IA　standard　of　the　discharge　standard　of　pollutants　for　municipal　wastewater　treatment　plant.　The　results　show　that　a　long　anaerobic　time　can　quickly　achieve　granulation,　however　the　particles　easily　disintegrate　during　a　long-term　operation.　Longer　anaerobic　time　can　reduce　the　inhibition　of　phosphorus　accumulating　organisms　release　phosphorus　by　nitrate,　help　enrich　DPAO,　and　obtain　a　better　nitrogen　and　phosphorus　removal　effect.　©　2020,　Science　Press.　All　right　reserved.