Abstract: Catalytic effects of Na, Ca, Fe and their composites on NO-char reaction in the presence of SO2 were investigated by Temperature Programmed Reaction (TPR) technique. The catalytic activity order of three metals is Fe>Ca>Na in the same conditions. SO2 may participate in the oxygen-transfer process to influence the metal catalytic effect in NO-char reaction. For three types of metal loaded catalysts, effects of SO2 concentration on their catalytic activities are different. The catalytic activity of Na loaded char is influenced most by the SO2 concentration. 2% Na or Fe loaded chars and 3% Ca loaded char have the highest NO conversion activity in the presence of SO2. Na-Fe and Na-Ca composite catalysts have higher catalytic activity. Synergistic effect of Na-Ca and Na-Fe may be responsible for the high NO conversion activity of these bimetallic catalysts in the presence of SO2.