Abstract: The commercial application of RMMC-1 (Hengyuan) in Shandong Hengyuan Petrochemical Company was introduced. Ltd. Considering the inferior feedstock such as CGO, the emphasis in design of RMMC-1 (Hengyuan) catalyst was put on the inhibition of aromatization and isomerization reactions as much as possible during the initial oil-catalyst contact to ensure long straight-chain hydrocarbon involved in cracking reaction and to increase the ring opening probability of naphthene and reduce the proportion of dehydrocyclization and condensation. The matrix of RMMC-1(Hengyuan) catalyst is characterized by large surface areas, which can effectively deal with the influence of basic nitrogen and other pollutants on the catalyst performance and improve the ability of heavy oil cracking and the yield of propylene. The running results show that the yield of total liquid and of light oil changes little, LPG and propylene yields increase. The conversion rate of feedstock and the gasoline yield increases 4.1 percentage points and 3.4 percentage points, respectively. While the yield of dry gas and diesel reduces 0.4 percentage point and 4.4 percentage points，respectively. The coke selectivity is significantly improved.