Abstract: A series of Y-Ce-Mn/ZSM-5 catalysts (Y=Co, Cr, Cu, La, Zr) were prepared by impregnation method. Combined with the results of the NH₃-SCR activity test, the optimal activity temperature window and maximum denitration efficiency of various catalysts were obtained. The catalysts were characterized by XRD, TEM, H₂-TPR, NH₃-TPD and in situ DRIFTS. Through the characterization and denitration test, it was shown that the maximum denitration efficiency of all modified catalysts except Cr modified one was higher than 98%, and Cu-Ce-Mn/ZSM-5 showed the best performance among the catalysts, whose catalytic conversion at 375℃ was 99.22%. This is attributed to the highly dispersed surface metal oxide species, more surface sites with weak acidity and more species with high reducibility.