Series of Fe/Cu-SSZ-13 catalysts with different Fe loading content were synthesized by sim-ple one-pot strategy.The obtained catalysts were subjected to selective catalytic reduction(SCR)of NOx with NH3 and were characterized by various techniques.The results show that Feo.63/Cu1.5o-SSZ-13 catalyst with proper Fe content exhibits excellent catalytic activity with widest operation temperature window from 160 to 580℃,excellent hydrothermal stability as well as good resistance to sulfur poisoning when compared with Cu-SSZ-13,signifying its great potential for practical applications.Further characterizations reveal that the syn-thesized Fe/Cu-SSZ-13 catalysts present typical chabazite(CHA)structure with good crys-tallinity,while isolated Cu2+and monomeric Fe3+are revealed as the predominant copper and iron species.At low temperatures,isolated Cu2+species act as primary active sites for SCR reaction,while monomeric Fe3+species provide sufficient active sites for sustain the SCR activity at high temperature.Moreover,Fe over doping would lead to the damage of ze-olite structure,destruction of isolated Cu2+site,as well as the formation of highly oxidizing Fe203,thus causing deterioration of catalytic performances.