The　effect　of　electron　acceptors　on　denitrifying　phosphorus　(P)　removal　and　its　community　structures　in　A(2)O　process　treating　domestic　wastewater　was　investigated　using　DNA　based　stable-isotope　probing　(DNA-SIP).　Stable　denitrifying　P　removal　in　anoxic　zone　of　A(2)O　process　was　achieved　with　an　average　denitrifying　P　removal　efficiency　of　72%.　Results　of　quantitative　polymerase　chain　reaction　indicated　that　clade　IIF　was　the　dominant　clade　for　denitrifying　P　removal.　NirS,　NirK　and　NarG　were　the　major　functional　genes　for　denitrification.　Batch　tests　were　conducted　with　unlabelled　and　C-13-labelled　sodium　acetate　as　carbon　sources,　which　confirmed　that　oxygen,　nitrate　and　nitrite　can　be　used　as　electron　acceptor.　High　throughput　sequencing　for　C-13-DNA　samples　indicated　that　polyphosphate　accumulating　organisms　(PAOs)　were　mainly　affiliated　with　phylum　Proteobacteria.　Candidatus_Accumulibacter　was　the　major　genus　using　oxygen　and　nitrate　as　electron　acceptors.　Acinetobacter　was　the　most　dominant　genus　using　nitrate　and　nitrite　as　electron　acceptors.　Unclassified_f_Rhodocyclaceae　appeared　in　three　P　removal　systems.　In　the　EBPR　process,　not　only　anaerobic　P-release　and　aerobic　P-uptake,　but　also　denitrifying　P　removal　should　be　considered.　Different　types　of　PAOs　corresponding　to　different　electron　acceptors　interacted　to　ensure　the　stable　performance　of　nitrogen　and　phosphorus　removal.