Nitrogen removal performance of SBBR reactor was investigated under the condition of continuous aeration with suspended packing by activated carbon coating modification. The results indicate that SBBR presents a good simultaneous nitrification and denitrification (SND) performance with the removal rates of NH₃-N and TN at 80.7% and 63.1% respectively. During a typical cycle, SND rate can reach 72.8%. Single factor experiments show that nitrogen removal rate increases as the increase of aeration time and it increases first and then decreases as the increase of dissolved oxygen concentration and packing dosing quantity. Secondary multivariate regression model is established with using response surface methodology and taking dissolved oxygen concentration, packing dosing quantity and aeration time as inspective factors and nitrogen removal rate as evaluation index. 69.28% nitrogen removal rate as the maximum value is obtained under optimal working conditions according to the model calculation as follows:dissolved oxygen concentration of 2.37 mg/L, packing dosing quantity of 40.10%, aeration time of 5.17 h. Verification test show that the deviation rate between predicted values and measured values is 1.57%.