The　shortcut　nitrification　for　different　initial　DO　mass　concentrations(0.5-1.0,　1.5-2.0,　2.5-3.0　and　3.5-4.0　mg/L)　was　studied　with　the　intermittent　aeration　SBR　(No.　1)　and　the　continuous　aeration　SBR　(No.　2)　treating　domestic　wastewater　at　normal　temperature　of　20-25°C.　The　results　show　that　there　are　no　fundamental　real　distinctions　in　COD　removal　efficiency　between　No.　1　and　No.　2.　Also,　when　the　two　reactors　run　for　50　d,　the　ammonia　nitrogen　removal　volume　loading　of　No.　1　is　more　than　No.　2.　The　nitrosation　rate　of　1#　is　still　above　90%　during　four　DO　periods,　while　the　nitrosation　rate　of　No.　2　decrease　from　90%　to　72.9%　gradually　after　the　DO　mass　concentration　is　increased　to　3.5-4.0　mg/L　and　then　it　takes　15　d　to　make　the　nitrosation　rate　of　No.　2　back　to　90%　by　the　use　of　intermittent　aeration.　The　relative　quantity　of　ammonia　oxidizing　bacteria　is　more　and　the　relative　quantity　of　nitrite　oxidizing　bacteria　is　less　in　the　intermittent　aeration　reactor.　Therefore,　the　intermittent　aeration　which　has　higher　ammonia　oxidation　rate,　then　itrosation　rate　and　energy　saving,　is　an　effective　means　to　maintain　efficient　and　stable　shortcut　nitrification　of　domestic　wastewater　and　at　normal　temperature　for　long-term　operation　of　SBR.