Partial　denitrification　is　an　alternative　process　to　provide　stable　nitrite　for　anammox.　In　this　study,　based　on　full-scale　and　lab-scale　experiments,　achieving　and　control　of　partial　denitrification　and　the　microbial　mechanism　were　studied　for　17　months　in　municipal　wastewater　treatment　plant　(MWWTP).　Using　glucose　(GLC)　as　sole　carbon　source,　partial　denitrification　was　successfully　achieved　with　nitrite　accumulation　percentage　(NAP)　higher　than　90%;　whereas,　using　sodium　acetate　(NaAc)　as　sole　carbon　source,　nitrite　accumulation　was　effec-tively　controlled　with　economic　and　efficient　carbon　usage.　Candidatus　Competibacter　and　Thaurea　were　the　dominant　communities　for　partial　denitrification.　Denitrifying　glycogen　accumulating　organisms　(DGAOs),　Thauera,　denitrifying　phosphorus　accumulating　organisms　(DPAOs),　GAOs,　PAOs　and　denitrifiers　coexisted　in　MWWTP,　resulting　in　COD　specific　removal　rate　(CODSRR)　of　883.10　similar　to　1188.92mgN/gMLVSS/h　during　partial　denitrification.　Through　adjustment　of　Anoxic-Oxic　(A/O)　operation　to　anoxic　operation,　the　growth　of　GAOs　and　PAOs　could　be　limited.