To　explore　the　effects　of　temperature　on　sludge　bulking　and　the　characteristics　of　microbial　community　structure　in　aerobic　granular　sludge　system,　three　sequencing　batch　reactors　were　used　with　artificial　wastewater　as　the　influent.　Illumina　sequencing　technology　was　used　to　analyze　the　microbial　community　structure　and　dynamic　changes　of　bacteria　in　aerobic　granular　sludge　system　at　10,18　and　25,respectively.The　results　showed　that　the　particle　sludge　settling　performance　of　the　18　was　good,　and　the　SVI　maintained　at　about　40mL/g.　But　under　the　conditions　of　10　and　25,　aerobic　granular　sludge　were　bulked,　of　which　the　SVI　were　194.67mL/g　and　100mL/g,　respectively.　According　to　the　qPCR　analysis,　at　10,　the　abundance　value　of　Sphaerotilus　Natans　was　the　highest　among　the　specific　filamentous　bacteria,　it　mass　propagation　of　this　bacterium　would　leaded　to　extremely　high　SVI.　Illumina　sequencing　results　showed　that　temperature　caused　the　significant　differences　of　dominant　species　among　these　three　systems.　The　predominant　strains　at　18　were　Tsukamurella　and　unclassified_f_Comamonadaceae,　this　system　had　a　good　pollutant　removal　ability.　And　at　10,　the　predominant　species　was　Sphaerotilus,　which　was　unable　to　utilize　complex　organic　matter.　As　for　the　system　at　25,　the　dominant　bacteria　were　Tsukamurella　and　unclassified_f_Microbacteriacea.　To　analyze　the　nitrogen　removal　performance　of　aerobic　granular　sludge　system　from　the　micro　point　of　view,　the　FAPROTAX　database　was　used　to　predict　the　differences　in　bacterial　metabolic　functions　at　different　temperatures.　At　18,　the　relative　abundance　of　nitrate　reduction　and　nitrate　respiration　bacteria,　which　were　kinds　of　nitrogen　cycling　functional　bacteria,　were　7.81%　and　7.78%,　higher　than　those　in　other　systems.　This　results　matched　the　better　nitrogen　removal　effect　at　the　same　temperatre.　©　2023　Chinese　Society　for　Environmental　Sciences.　All　rights　reserved.