The　effect　of　added　carbon　source　and　nitrate　concentration　on　the　denitrifying　phosphorus　T　removal　by　denitrifying　phosphorus　removal　bacteria　sludge　was　systematically　studied　using　batch　0　experiments,　at　the　same　time　the　variation　of　ORP　was　investigated.　Results　showed　that　the　denitrifying　and　phosphorus　uptake　rate　in　the　anoxic　phase　increased　with　the　high　initial　anaerobic　carbon　source　addition.　However,　once　the　initial　COD　concentration　reached　a　certain　level,　which　was　in　excess　of　the　U　PHB　saturation　of　Poly-p　bacteria,　residual　COD　carried　over　to　the　anoxic　phase　inhibited　the　subsequent　denitrifying　phosphorus　uptake.　This　was　equal　to　supplementing　the　external　carbon　source　to　the　anoxic　phase,　furthermore　the　higher　the　external　carbon　source　concentration　the　more　powerful　the　inhibition　caused.　High　nitrate　concentration　in　the　anoxic　phase　increased　the　initial　denitrifying　phosphorus　rate.　Once　the　nitrate　was　exhausted,　phosphate　uptake　changed　to　phosphate　release.　Moreover,　the　time　of　this　turning　point　occurred　later　with　the　higher　nitrate　addition.　On　the　other　hand,　through　on-line　monitoring　the　variation　of　the　ORP　with　different　initial　COD　concentration,　it　was　found　that　ORP　could　be　used　as　a　control　parameter　for　phosphorus　release,　but　it　is　impossible　to　utilize　ORP　for　controlling　the　dinitrification　and　anoxic　phosphorus　uptake　operations.