Abstract: A new high efficient heavy oil conversion catalyst A was developed and commercialized for a RFCC unit with a capacity of 3.5 Mt/a. The lab results showed that the slurry and coke yield reduced; the total liquid yield increased slightly and the propylene yield increased significantly. The commercial application results show that compared with the results of the original catalyst，using the feed with same properties, the metal content on the equilibrium catalyst decreases, propylene yield increases by 1.07 %, slurry yield lowers by 2.91% , RON of FCC gasoline increases by 0.59, the NOx concentration at CO incineration flue gas furnace outlet decreases slightly.