The　stable　performance　of　aerobic　granular　sludge　would　be　affected　by　various　factors.　The　type　of　carbon　source　was　reported　to　have　impact　on　the　synthesis　of　poly　hydroxy　acid　lipid　(PHA),　consequently　affect　the　stability　of　the　aerobic　granular　sludge.　In　this　study,　the　aerobic　granular　sludge　was　cultivated　with　the　mixed　carbon　source,　and　the　effect　of　different　carbon　source　on　the　PHA　synthesized　by　aerobic　granular　sludge　was　investigated.　The　tests　were　conducted　with　8kinds　of　carbon　source　including　sodium　acetate,　methanol,　glucose,　maltose,　starch,　sugar,　glutamic　sodium　and　peptone.　The　results　showed　that　the　aerobic　granular　sludge　had　better　performance　for　transforming　the　sodium　acetate　and　sugar　to　PHA,　with　the　storage　capacity　reached　up　to　102.19　mgCOD/g·VSS　and　70.58　mg　COD/g·VSS,　respectively.　This　was　significantly　higher　than　the　value　using　the　other　carbon　source,　which　was　in　the　range　of　5~20　mg/g·VSS.　Therefore,　it　was　beneficifal　to　maintain　the　stable　performance　of　granular　sludge　by　using　sugar　and　sodium　acetate　as　carbon　source.　However,　the　lowest　storage　of　PHA　was　found　when　methanol　was　used.　©,　2015,　Chinese　Society　for　Environmental　Sciences.　All　right　reserved.