Three　column　Sequencing　Batch　Reactor　(SBR)　(R1,　R2,　R3)　with　reactor　height/diameter　ratio　of　3:1,　4.5:1　and　6:1　were　used　in　this　experiment.　The　actual　domestic　sewage　was　taken　as　influent　and　inoculate　the　sludge　returned　from　the　secondary　sedimentation　tank　of　the　sewage　treatment　plant.　Study　the　impact　of　SBR　height/diameter　ratio　on　the　formation,nitrogen　and　phosphorus　removal　and　decarburization　of　aerobic　granular　sludge　in　domestic　sewage.　The　results　showed　that　R1,　R2,　R3　are　started　successfully　with　42,35　and　28d　respectively.　The　average　size　of　the　aerobic　granular　sludge　in　R1,　R2　and　R3　are　750,　900　and　1100μm　when　the　granules　have　matured.　In　the　start-up　stage,　The　removal　rates　of　TN　of　R1,　R2　and　R3　are　66%,　61%　and　62%,　respectively.　After　the　granular　sludge　matured,　the　effluent　of　R1,　R2　and　R3　all　reachesA　standard　of　the　Urban　Sewage　Treatment　Plant　Pollutant　Discharge　Standard　of　China,　and　the　removal　rates　of　TN,　TP　and　COD　are　79%,　85%　and　91%,　91%,　93%　and　94%　and　89%,　92%　and　93%　respectively.　Further　analysis　shows　that　within　the　scope　of　this　experimental　study,　the　increase　of　SBR　height/diameter　ratio　is　beneficial　to　the　formation　of　aerobic　granular　sludge　and　increasing　the　size,　so　that　the　precipitation　performance　and　the　simultaneous,　nitrogen　and　phosphorus　removal　performance　improved.　©　2019,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.