With Ni-Cr-Fe alloy as catalyst supports and the MnCr2O4 complex oxide as main active component,The catalyst was characterized by XRD and SEM.Used C6H6 as reducing agent,the catalytic performance was investigated by selective catalytic reduction of NOx experiment.The results demonstrate that the catalyst is homogeneous,exhibits high catalytic activity,the conversion ratio of NOx is up to 78%,the conversion ratio of C6H6 is up to 81%,the formation amount of CO is less,nearly completely produce CO2.The catalyst has good redox property.