Abstract: Metal-supported zeolite catalysts have been widely used in the NH₃ selective catalytic reduction (NH₃-SCR) reactions due to their wide temperature window and good hydrothermal stability. In this review, the research progress in the structural characteristics, catalytic performance and reaction mechanism of Cu- and Fe-based zeolite catalysts in NH₃-SCR was summarized. In addition, the application of density functional theory (DFT) calculation in clarifying the reaction mechanism of NH₃-SCR was introduced. Finally, the reaction kinetics and the apparent kinetic parameters of different metal-based zeolite catalysts in NH₃-SCR were compared and discussed. We hope this review could provide new ideas for the study of NH₃-SCR reaction mechanism over metal-supported zeolite catalysts.