Abstract: According to the commercial data of 3# residual fluid catalytic cracking(RFCC) processing hydrotreated residuum in Maoming Petrochemical Company and the characteristics of hydrotreated residuum,a kinetic model with 14 lumps for hydrotreated residuum fluid catalytic cracking based on the SARA composition of the residuum stock was established.Its kinetic parameters were determined by the stepwise-method.The results were verified with commercial data,which showed that the model could predict not only the distribution of products, but also the quality of the main products and describe the reaction process of hydrotreated residuum fluid catalytic cracking.The model could be useful in optimizing the operation of a commercial unit.