Abstract: The new generation of DCC catalysts, DMMC/RMMC series developed by RIPP are introduced. The large molecule cracking ability is enhanced by increasing the portion of large pores; coke selectivity is improved by adjusting the acidity site density of matrix surface; selective cracking reactions are increased, and the sphericity of catalysts is improved by adopting new preparation method. The commercial results shown DMMC/RMMC series catalyst increase the propylene yields respectively by 2.43w%，0.8w% and 1.3w% for mixed VGO, VGO plus AR，and hydrotreated VGO feed compared to the previous catalysts while some of other product yields were improved. The enterprises made more profits after using new DCC catalysts.

Key words: VGO, resid, catalytic cracking, catalyst, propylene, light olefins