The　multi-feed　multilevel　A/O　biological　nitrogen　removal　process　has　distinct　advantages　in　nitrogen　removal.　Currently,　the　researches　all　over　the　world　on　the　multi-feed　biological　nitrogen　removal　process　are　limited　only　on　the　process　emulation　and　synthetic-sized　wastewater.　By　using　real-wastewater　simulate　with　the　multi-feed　process,　the　operational　characteristics　and　the　optimal　controlled　operation　were　more　comp　retentively　investigated　with　3　steps　each　with　different　ρ(C)/ρ(N)　ratios.