The　effects　of　anaerobic　reaction　time　and　COD　concentration　on　denitrifying　phosphorus　removal　efficiency　of　A2O-BAF　process　were　studied　in　parallel　batch　experiments,　at　the　same　time　the　relationship　between　denitrifying　phosphorus　uptake　amount　and　nitrate　consumption　was　investigated　in　anoxic　condition.　The　results　found　that　as　anaerobic　reaction　time　from　30　min　to　120　min　and　COD　concentration　from　50　mg/L　to　200　mg/L　increased,　phosphorus　release　amount,　denitrifying　phosphorus　uptake　amount,　net　phosphorus　uptake　amount　and　nitrate　removal　amount　increased,　but　the　ratio　of　denitrifying　phosphorus　uptake　amount　and　release　amount　remained　almost　unchanged.　In　the　all　tests,　a　good　linear　relationship　between　denitrifying　phosphorus　uptake　amount　and　nitrate　consumption　was　presented　in　anoxic　condition,　with　the　linear　coefficient　and　correlation　coefficient　ranging　from　1.007　to　1.053　and　0.992　to　0.997　respectively,　which　showed　the　sludge　intrinsic　characteristics　in　the　anaerobic/anoxic/aerobic　process　with　biological　aerated　filter　(A2O-BAF)　denitrifying　phosphorus　removal　system.　©,　2015,　Chinese　Society　for　Environmental　Sciences.　All　right　reserved.