A　novel　post-endogenous　denitrification　and　phosphorus　removal　(post-EDPR)　system　was　developed　by　enriching　denitrifying　glycogen　accumulating　organisms　(DGAOs)　and　phosphorus　accumulating　organisms　(PAOs)　to　treat　low　carbon/nitrogen　(C/N)　wastewater　(C/N　=　4.4).　The　unique　feature　of　the　post-EDPR　system　was　the　continuous　alternating　anaerobic/oxic/anoxic　zone　(3.1　h/3.9　h/7　h)　with　suspended　biofilm　carriers　in　oxic　zone.　The　132-day　test　results　showed　that　extended　anaerobic　and　anoxic　stage　strengthened　the　intracellular　carbon　storage　and　endogenous　denitrification.　Low　dissolved　oxygen　(DO)　concentration　(1-2　mg/L)　in　oxic　zone　promoted　the　simultaneous　nitrification　and　denitrification　(SND)　and　saved　aeration　energy,　nitrifiers　were　enriched　with　the　biofilm　carriers　and　nitrification　performance　was　strengthened,　so　oxic　hydraulic　retention　time　(HRT)　could　be　shortened　to　avoid　excessive　polyhydroxyalkanoate　(PHA)　consumption　which　would　be　used　for　the　latter　anoxic　denitrification.　In　a　steady　state,　the　system　achieved　advanced　nitrogen　and　phosphorus　removal　(TIN　(total　inorganic　nitrogen)　＜=　3　mg/L,　PO43-　-　P　＜=　0.2　mg/L)　with　a　high　removal　efficiency　of　92.15%　and　92.67%,　respectively,　and　PHA　played　a　major　role　for　P-uptake　and　endogenous　denitrification.　Microbial　community　analysis　demonstrated　that　PAOs　and　GAOs　were　enriched　and　performed　aerobic　P-uptake　and　anoxic　endogenous　denitrification,　respectively.