Abstract: Various transition metal oxide promoters were added respectively into Na2CO3-γ-Al2O3 sorbent for removing SO2 and NO from flue gas. The effect of promoters on the adsorption performance of sorbent was studied by a fixed-bed reactor, and the influence of adsorption conditions on the performance of modified sorbent was investigated. Results showed that MnO2-modified Na2CO3-γ-Al2O3 exhibited the best adsorption performance due to enhancing the surface lattice oxygen concentration of the sorbent, which could promote the oxidation of SO2 and NO and increase the adsorption capacity of sorbent. The optimum adsorption conditions for Mn-Na2CO3-γ-Al2O3 were as follows: SO2/NO molar ratio of 2, the adsorption temperature in the range of room temperature to 50 ℃ and oxygen volume fraction of over 2.0%.