In　order　to　analyze　the　effect　of　different　temperatures　on　PAOs　decay,　a　lab-scale　EBPR　culture　with　PAOs　over　90%±2%　of　the　entire　bacterial　was　used　under　different　conditions　(10°C　anaerobic,　10°C　aerobic,　20°C　anaerobic,　20°C　aerobic).　The　results　show　that　the　decay　rate　increases　with　the　increase　of　temperature;　the　average　rate　during　1~9　days　is　(respectively:　10°C　anaerobic,　10°C　aerobic,　20°C　anaerobic,　20°C　aerobic)　0.053/d,　0.50/d,　0.072/d,　and　0.145/d;　the　cell　death　rate　is　0.019/d,　0.017/d,　0.019/d,　and　0.03/d,　which　accounts　for　35.8%,　34%,　26.4%,　and　20.7%　of　the　decay　rate,　respectively.　The　concentration　of　PHA　and　glycogen　decreases　during　the　decay　period.　And　Glycogen　degrades　quickly　in　anaerobic　conditions　than　in　aerobic　conditions　under　the　same　temperature.　The　glycogen　degrade　rate　is　higher　with　the　increase　of　temperature　under　the　same　anaerobic　and　aerobic　conditions.