Abstract: Reducing NOx emission additives for FCC flue gas (RDNOx，types I and II) were developed. RDNOx-I, a non-noble metal additive, is used to reduce NOx emission through catalyzing the reaction of NOx reduction. RDNOx-II, a noble metal additive, is used to substitute Pt based CO promoter, as it can promote CO combustion and decrease NOx formation at the same time. RDNOx-I and II can be used separately or simultaneously. The evaluation results show that when 0.5%-0.9% of RDNOx-II and 2-4% of RDNOx-I are applied, NOx emission in flue gas is reduced by about 50%-64%, while no negative influence on FCC product distribution is observed.