Investigated　the　effects　of　three　different　types　of　electron　acceptors　on　phosphate　uptake　in　anaerobic-aerobic　(An/O)　process.　The　results　indicated　that　there　were　denitrifying　phosphorus　removal　bacteria　(DPB)　in　An/O　process.　The　rate　of　DPB　to　phosphorus　removal　organisms　(PAOs)　in　An/O　process　varied　in　the　nitrate　concentration.　The　low　rate　of　COD/TP　would　be　favor　to　the　growth　of　DPB.　The　data　obtained　suggested　that　in　addition　to　the　two　well-accepted　electron　acceptors　(oxygen　or　nitrate)　for　PAOs,　the　nitrite　was　an　alternative　electron　acceptor　while　its　concentration　was　below　the　threshold　concentration　(＜95　mg/L).　Furthermore,　the　results　confirmed　that　the　speed　and　quantity　of　phosphate　uptake　in　aerobic　condition　were　higher　than　in　anoxic　(nitrate　or　nitrite)　one,　but　the　energy　requirement　and　the　sludge　production　were　reverse　absolutely.