Low　temperature　environment　was　one　of　the　difficulties　in　sewage　treatment.　In　this　study,　the　removal　efficiency　of　multistage　AO　process　was　analysed　under　different　hydraulic　residence　time　(12　h,　8　h　and　6　h)　and　inlet　flow　distribution　ratio(5　:　4　:　4,　3　:　2　:　1　and　25　:　15　:　6),　the　rules　of　pollutant　migration　and　transformation　were　compared　and　analysed　under　different　control　parameters.　The　results　show　that　enhanced　nitrogen　removal　and　optimised　organics　utilisation　were　obtained　simultaneously　in　the　feeding　process　with　hydraulic　retention　time　of　8　h　as　well　as　influent　distribution　ratio　of　3　:　2　:　1.　HRT　and　inlet　flow　distribution　ratio　affect　nitrogen　load　and　organic　matter　distribution　in　each　stage　of　the　multistage　AO　system,　the　removal　efficiency　of　ammonia　nitrogen　in　each　stage　of　the　system　was　more　than　80%　under　optimal　conditions,　the　total　nitrogen　removal　rate　was　more　than　80%,　among　which　the　synchronous　nitrification　and　denitrification　account　for　29.50%.