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This research has been performed to evaluate the stoichiometric relationship between removed COD and nitrogen or phosphorus. A modified A2/O process, which was equipped with an external nitrification tank and a switching reactor, was operated with a capacity of 50m3/d.From the results, it has been concluded that the stoichiometric values were varied by temperature condition or input COD loads. In case of denitirfication, the requirement g COD for removed nitrate nitrogen ranged 0.13 to 10.5g, and the compensation coefficient of temperature was evaluated as 1.028. For phosphorus removal, the required COD was about 7.5 gCODconsumed/gPreleased and 0.54 gPHACODstorage/gPuptake. During rainy season, as it appeared a lower organic substrate loads, the PHA(Poly Hydroxy Alkanoate) contents of biomass was reduced. From the relationship between influent BOD5 and the sum of removed TN and TP, the ratio for rainy and winter season was about 4.8 and 5.8 g BOD/g (TN+TP) each others. Therafor, the substrat ratios for nitrogen and phosphorus removal appeared to be affected by temperature and influent organic substrate loads.