A sequencing batch reactor (SBR) system treating liquid swine-manure at 5, 10 and 21-degrees-C was studied. The SBR performance was seriously affected at an operating temperature of 5-degrees-C, but at 10-degrees-C a significant improvement in the system performance was achieved. The combined removal and/or conversion of NH4+, NO(x)-N and COD at 10-degrees-C were quite satisfactory compared with the effluent quality from the SBR reactor at 21-degrees-C. COD and NH4+-N removals were 96.7% and 97.0% at 10-degrees-C and 97.3% and 99.8% at 21-degrees-C, respectively. Based on process analysis, a kinetic model was developed to describe the specific biochemical reactions occurring in the system including nitrification, denitrification, hydrolysis of organic nitrogen and COD biodegradation. The values of the kinetic constants in the model were estimated from experimental data obtained in this study and these values were used to quantitatively account for the temperature effect on the performance of the SBR system.