Denitrifying　phosphorus　removal　sludge　are　usually　faced　with　various　famine　environments　in　wastewater　treatment　plants　(WWTPs).　Endogenous　metabolisms　under　aerobic,　anoxic,　and　anaerobic　starved　conditions　were　characterized　to　investigate　their　impact　on　survival　and　activities　of　denitrifying　polyphosphate　accumulating　organisms　(DPAOs).　DPAOs　utilized　intracellular　polymers　to　survive　and　presented　diverse　consumed　priorities　of　PHA　types　under　various　starvations.　The　biomass　decay　rate　was　approximately　2.7　and　1.7　times　lower　for　aerobic　condition　than　for　anoxic　and　anaerobic　conditions　owing　to　the　maximum　maintenance　energy　requirement　for　aerobic　condition　(68.6　mmol/C-molVSS　ATP).　During　short-term　starvations,　significant　activity　decay　for　anaerobic　starved　sludge　was　attributed　to　its　distinctive　endogenous　metabolisms.　For　longterm　starvations,　the　higher　amounts　and　preponderant　type　of　PHA　(PHB)　reserve　favored　to　the　greater　DPAO　activities　for　anoxic　starved　sludge.　The　results　show　that　anoxic　condition　may　be　an　implementable　strategy　for　maintaining　denitrifying　phosphorus　removal　performance　in　WWTPs.