Aeration　intensity　is　an　important　parameter　to　control　intermittent　aeration　DO.　To　clarify　the　effects　of　same　total　aeration　intensities　and　different　aeration　intensities　on　the　intermittent　aeration　SBR　nitrosation　process,　activated　sludge　with　good　nitration　abilities　was　inoculated　in　reactors　at　25-28　.　Effect　of　aeration　intensity　under　intermittent　aeration　on　the　stability　of　nitrosation　system　was　studied　using　response　surface　analysis　in　an　intermittent　aeration　SBR　reactor.　Results　show　that　the　controlled　aeration　intensity　of　1.2　L/(h　·　L)　could　inhibit　the　activity　of　NOB,　where　the　nitrite　nitrogen　accumulation　rate　could　reach　93%,　while　the　ammonia　nitrogen　removal　rate　was　only　80%.　When　the　aeration　intensity　was　increased　to　1.58　L/(h　·　L),　the　nitrosation　performance　was　deteriorated　with　the　increase　of　the　operating　cycle.　When　the　aeration　intensity　was　1.93　L/(h　·　L),　and　the　ammonia　oxidation　rate　and　nitrite　accumulation　rate　were　90%　and　91.6%,　higher　ammonia　oxygen　removal　and　nitrite　accumulation　were　achieved.　Batch　experiments　and　response　surface　analysis　showed　that　aeration　intensity　and　aeration　time　had　significant　effects　on　ammonia　nitrogen　removal　and　nitrite　accumulation.　The　shorter　the　aeration　time　was,　the　higher　the　nitrite　accumulation　rate　would　be　achieved,　and　the　higher　the　aeration　intensity　was,　the　higher　the　ammonia　nitrogen　removal　efficiencies　would　be　achieved.　However,　the　activity　of　AOB　was　suppressed　under　low　aeration　intensity,　and　the　high　ammonia　nitrogen　removal　efficiency　could　not　be　maintained　by　prolonging　the　aeration　time.　Under　high　aeration　intensity,　the　activity　of　AOB　could　not　be　enhanced　accordingly.　The　ammonia　nitrogen　removal　rate　and　the　nitrite　accumulation　rate　were　only　affected　by　the　aeration　time.　Therefore,　under　the　same　total　aeration　intensities,　higher　aeration　intensity　should　be　adopted　with　the　combination　of　short　aeration　time　to　achieve　high　ammonia　nitrogen　removal　and　nitrite　accumulation.　Copyright　©2020　Journal　of　Harbin　Institute　of　Technology.All　rights　reserved.