In　order　to　study　the　formation　of　aerobic　granular　sludge　and　nutrients　removal　characteristics　under　low　temperature,　a　sequencing　batch　reactor　(SBR)　has　been　operated　at　15.　The　results　showed　that　the　mature　AGS　which　have　good　performance　of　partial　nitrification　were　obtained　within　60days　and　nitrite　accumulation　rate　(NAR)　can　achieve　above　90%　in　stable　operation　stages.　The　picture　of　scanning　electron　microscopy　(SEM)　showed　that　AGS　mainly　consisted　of　short　bacillus　and　cocci.　The　nutrients　removal　performance　of　AGS　in　different　particlesizes　R1(1.0~2.0mm),　R2(2.0~3.0mm),　and　R3(above　3.0mm)　were　investigated　by　gas　collector　batch　tests　under　15.　The　nutrients　removal　performanceof　R2　and　R3　were　better　than　R1　and　their　NAR　were　above　90%.　The　increase　of　particle　size　would　affect　mass　transfer　of　substrate　and　then　provide　appropriate　places　for　ammonium　oxidizing　bacteria　(AOB),　nitrite　oxidizing　bacteria　(NOB)　and　denitrifying　bacteria　which　are　good　for　nitrification.　The　depth　of　DO　in　AGS　was　600~700μm　when　the　DO　in　the　bulk　water　was　6~7mg/L　at　15　through　the　determination　of　microelectrode.　©　2019,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.