Advanced　nitrogen　removal　without　the　addition　of　external　carbon　source　is　challenging　in　the　conventional　biological　nitrogen　removal　processes.　This　study　presented　a　novel　anaerobic/aerobic/anoxic　sequencing　batch　reactor　(A/O/A　SBR)　based　on　endogenous　nitrate　(NO3--N)　respiration　to　enhance　nitrogen　removal.　The　mean　effluent　total　nitrogen　(TN)　in　the　A/O/A　SBR　could　be　reduced　to　as　low　as　3.5　mg/L,　when　the　average　influent　TN　and　chemical　oxygen　demand　(COD)　were　52.7　and　235.4　mg/L,　respectively.　This　advanced　nitrogen　removal　was　attributed　to　the　post-denitrification,　since　82.7%　of　TN　removal　was　achieved　in　the　post-anoxic　stage.　The　post-denitrification　rate　with　nitrite　(NO2--N,　0.59　mg　NO2--N/gMLVSS/h)　was　higher　than　that　with　NO3--N　(0.35　mg　NO3--N/gMLVSS/h).　Therefore,　the　post-anoxic　time　could　be　further　optimized　by　achieving　denitrification　via　NO2--N.　The　A/O/A　SBR　has　good　potential　in　achieving　advanced　nitrogen　removal,　especially　in　nitrogen-sensitive　rural　areas.