Abstract: A test study on removal of SO2 and NOx simultaneously from flue gas by using the chemical enhancer to intensify the purification efficiency of the biofilm-packing tower was performed.The results showed when the compositions of the chemical enhancer were added in accordance with optimum concentration into the biofilm-packing tower were 0.25 mg/L La(NO3)3·6H2O,0.25 mg/L Ce(NO3)3·6H2O,0.5 g/L MgSO4·7H2O and 0.3 g/L NaAc·H2O,the purification efficiency of SO2 and NOx could be reached 100% and 61.78% respectively.And through a long-time continuous running test,the results indicated that the NOx purification efficiency of biofilm-packing tower with the added chemical enhancer was much better than that of the blank test,the mean value of NOx purification efficiency was increased by 14.78%,compared with the blank test,during that period the SO2 purification efficiency of the two towers were both 100%.This test study has provided the foundation for the new chemical enhancement technology on promoting the performance of biofilm-packing tower to removal of SO2 and NOx simultaneously from flue gas,especially for promoting the removal of NOx.