Using　Sequencing　Batch　Reactor　(SBR)　treating　domestic　wastewater,　quick　start　of　partial　nitrification　was　carried　out　through　the　mode　of　alternating　anoxic/oxic.　Time　of　achieved　partial　nitrification,　treatment　efficiency　and　ammonia　utilization　rate　were　investigated　in　different　ratio　of　anoxic/oxic　time.　The　results　showed　that　the　ratio　of　anoxic/oxic　time　was　1:1　and　2:1,　while　two　systems　nitrite　accumulation　rate　raised　to　90%　after　31　days　and　55days　respectively,　the　state　of　partial　nitrification　was　stable.　Besides,　ammonia　removal　efficiency　was　attained　above　95%　and　the　COD　effluent　concentration　was　less　than　50　mg/L.　The　total　nitrogen　removal　was　enhanced　about　20%,　and　pollutants　removal　efficiency　was　increased.　Form　the　complete　nitrification　to　the　partial　nitrification,　ammonia　utilization　rate　increased　67.5%　and　89.8%　respectively,　at　the　same　time,　efficiency　of　the　partial　nitrification　was　improved.　Meanwhile,　sludge　had　significantly　better　settling　performance,　sludge　volume　index　was　stable　at　60~80　mL/g.　©,　2015,　Chinese　Society　for　Environmental　Sciences.　All　right　reserved.