Both　temperature　and　dissolved　oxygen　(DO)　have　impact　on　partial　nitrification.　Through　experiment　and　analysis　in　this　study,　the　collaborative　effect　of　temperature　and　DO　on　partial　nitrification　can　be　expressed　as　(temperature　increases　1　degrees　C)/(DO　decreases　0.1mgL(-1))=4.28.　However,　increasing　temperature　for　wastewater　treatment　plant　is　scarcely　possible.　With　room　temperature　(19-22　degrees　C),　140　cycles　experiments　were　conducted　in　sequencing　batch　reactor　(SBR).　Results　showed　that　DO　concentration　of　0.2-0.8mgL(-1)　is　suitable　for　rapidly　startup　of　partial　nitrification.　No　visible　difference　between　0.2　and　0.5mgL(-1)　and　0.5-0.8mgL(-1)　on　rapidly　startup　of　partial　nitrification　was　existent.　Microbiological　analysis　showed　that　system　mainly　contained　10　groups,　-Proteobacteria,　uncultured　bacterium,　and　Bacteroidetes　were　three　dominant　populations　whose　percentage　were　32.5,　28.75,　and　17.5%,　respectively.　Compared　to　the　percentage　of　nitrite-oxidizing　bacteria　(NOB),　ammonium-oxidizing　bacteria　(AOB)　had　an　obvious　advantage,　which　demonstrated　the　enrichment　of　AOB　and　achievement　of　partial　nitrification.　A　model　related　to　nitrite-accumulated　rate　(),　AOB　biomass　(X-A),　and　NOB　biomass　(X-N)　was　established　in　this　study.　Combined　microbiological　analysis　with　model　calculation,　the　proportion　of　X-N　not　related　to　nitrite　oxidation　can　be　draw　during　startup　of　partial　nitrification.