The　possibility　of　influent　carbon　source　usage　by　influent　bypass　flow　strategy　in　the　anaerobic-anoxic-oxic　(AAO)　process　was　investigated,　aiming　at　enhancing　biological　nitrogen　removal　based　on　enriched　denitrifying　phosphate　accumulating　organisms　(DNPAOs).　Tests　were　made　to　verify　whether　nitrogen　removal　from　brewage　wastewater　was　improved　effectively　by　increasing　lambda　(denoted　as　the　ratio　of　influent　bypass　flow　rate　to　influent　flow　rate).　lambda　applied　in　the　study　was　0,　0.1,　0.15　and　0.25.　Results　showed　that　the　optimal　lambda　was　0.15;　the　corresponding　NH4+-N,　PO43　-P　and　TN　removal　efficiency　reached　90%,　95%　and　85%,　respectively;　and　the　ratio　4　4　of　anoxic　P　uptake　to　aerobic　P　uptake　was　increased　by　56.2%.　Furthermore,　the　results　also　demonstrated　that　when　the　optimal　lambda　was　adapted　to　treat　the　low　influent　C/N　ratio　wastewater,　TN　removal　efficiency　was　increased　by　13.2%.　Therefore,　it　was　possible　to　optimize　the　operation　of　the　AAO　process　by　influent　bypass　flow　under　good　denitrifying　phosphorus　removal　performance.