In　order　to　investigate　the　characteristics　of　removing　phosphorus　and　nitrogen　in　wastewater　with　nitrate　and　nitrite　nitrogen　as　electron　acceptors,　two　anaerobic/anoxic　sequencing　batch　reactors　were　adopted　to　treat　compounded　wastewater　containing　phosphorus.　Each　reactor　is　with　16　L　valid　volume,　6.5　h　reaction　period　and　32　days　SRT.　The　operating　method　was　as　follows:　concentrated　inlet-anaerobic　agitation　(2　h)-anoxic　agitation　(4　h)-sedimentation　(0.5　h)-decanting.　At　the　beginning　of　anoxic　phase,　sodium　nitrate　was　put　into　one　reactor　(No.1),　and　sodium　nitrite　into　another　reactor　(No.2).　The　reactors　were　run　for　two　periods　each　day.　The　reactors　could　steadily　remove　nitrogen　and　phosphorus　simultaneously　after　2-3　weeks　since　beginning,　which　showed　that　the　reactors　were　started　up　successfully.　The　average　ratios　of　removing　total　phosphorus　and　nitrate　nitrogen　in　the　reactor　of　No.1　were　69%　and　89%,　respectively.　And　the　average　ratios　of　removing　total　phosphorus　and　nitrite　nitrogen　in　the　reactor　of　No.2　were　75%　and　91%,　respectively.　Partial　nitrate　nitrogen　was　transformed　to　nitrite　nitrogen　while　it　was　served　as　electron　acceptor,　and　they　played　the　role　of　electron　acceptors　together　to　remove　nitrogen　and　phosphorus　in　wastewater.　It　is　concluded　that　both　nitrate　nitrogen　and　nitrite　nitrogen　can　be　served　as　electron　acceptors　to　remove　phosphorus,　and　they　can　remove　nitrogen　and　phosphorus　simultaneously　in　anoxic　condition.　Moreover,　the　efficiency　of　removing　nitrogen　and　phosphorus　by　nitrite　nitrogen　is　higher　than　that　by　nitrate　nitrogen.