To　improve　the　scientific　management　level　and　effluent　quality　of　a　municipal　wastewater　treatment　plant　(WWTP),　the　relationship　between　the　phosphorus　removal　approach　and　operating　parameters　of　the　A/A/O　technology　was　analyzed　by　sampling　and　analyzing　samples　from　the　treatment　technology　process　of　a　WWTP　in　Beijing,　and　also　the　phosphorus　material　balance　was　assessed　for　the　sewage　treatment　system.　The　results　showed　that　the　denitrifying　phosphorus　removal　played　remarkably　a　role　for　phosphorus　removal　in　the　anoxic　zone　of　A/A/O　process.　The　absorption　of　phosphorus　in　anoxic　zone　had　exceeded　the　quantity　in　the　oxic　zone.　The　nitrate　concentration　in　the　returned　nitrifying　liquid　had　an　influence　on　the　denitrifying　phosphorus　removal.　The　relationship　between　phosphorus　removal　and　sludge　load,　sludge　retain　time　(SRT)　showed　negative　correlation.　When　the　sludge　load　was　about　0.15　kg/(kg·d)　and　the　SRT　was　about　10-12　d　in　A/A/O　process,　the　phosphorus　removal　rate　was　up　to　88%.　There　was　also　a　negative　correlation　relationship　between　the　phosphorus　accumulation　and　the　sludge　emission　capacities　in　the　wastewater　treatment　system.　When　the　sludge　emission　capacities　were　controlled　to　2.0-2.5　percent　inflow　of　the　treatment　plant,　the　phosphorus　removal　efficiency　could　be　kept　on　stable　and　economic　status.