Abstract:The stable operation of dephosphorization-nitrosation was realized by a sequencing batch reactor (SBR) with improved operating strategy at normal temperature (20~25℃). The operating strategy include water loading, anaerobic mixing, aeration mixing, settling, drainage, selective sludge discharging and sludge bed anoxic mixing. In addition, the sludge age was 20d and the dissolved oxygen was 0.2~0.5mg/L. The results showed that the TP removal rate was 95.9%~97.1% and the volumetric load of ammonium removal during aeration phase was 0.242kg N/ (m3×d).The effluent of dephosphorization-nitrosation with the TP was 0.1~0.4mg/L and the ratio of ammonia nitrogen and nitrite nitrogen was about 1:1, which was appropriate for the influent of anaerobic ammonium oxidation process.