In　order　to　enhance　phosphorus　removal　in　traditional　step-feed　anoxic/oxic　nitrogen　removal　process,　a　modified　pilot-scale　step-feed　anaerobic/anoxic/oxic　(SFA(2)/O)　system　was　developed,　which　combined　a　reactor　similar　to　UCT-type　configuration　and　two-stage　anoxic/oxic　process.　The　simultaneous　nitrogen　and　phosphorus　removal　capacities　and　the　potential　of　denitrifying　phosphorus　removal,　in　particular,　were　investigated　with　four　different　feeding　patterns　using　real　municipal　wastewater.　The　results　showed　that　the　feeding　ratios　(Q(1))　in　the　first　stage　determined　the　nutrient　removal　performance　in　the　SFA(2)/O　system.　The　average　phosphorus　removal　efficiency　increased　from　19.17%　to　96.25%　as　Q(1)　was　gradually　increased　from　run　1　to　run　4,　but　the　nitrogen　removal　efficiency　exhibited　a　different　tendency,　which　attained　a　maximum　73.61%　in　run　3　and　then　decreased　to　59.62%　in　run　4.　As　a　compromise　between　nitrogen　and　phosphorus　removal,　run　3　(Q(1)　=　0.45Q(total))　was　identified　as　the　optimal　and　stable　case　with　the　maximum　anoxic　phosphorus　uptake　rate　of　1.58　mg.(g　MLSS)(-1).h(-1).　The　results　of　batch　tests　showed　that　ratio　of　the　anoxic　phosphate　uptake　capacity　to　the　aerobic　phosphate　uptake　capacity　increased　from　11.96%　to　36.85%　with　the　optimal　influent　feeding　ratio　to　the　system　in　run　3,　which　demonstrated　that　the　denitrifying　polyP　accumulating　organisms　could　be　accumulated　and　contributed　more　to　the　total　phosphorus　removal　by　optimizing　the　inflow　ratio　distribution.　However,　the　nitrate　recirculation　to　anoxic　zone　and　influent　feeding　ratios　should　be　carefully　controlled　for　carbon　source　saving.