Abstract: Based on studying the reaction chemistry of catalytic cracking, MIP-DCR process was developed to reduce the dry gas and coke yields in FCC process theoretically. The principles of development were discussed and some possible operation modes of MIP-DCR process were explored on a small scale of experimental unit. It was found that operating under higher catalyst activity and lower catalyst to oil ratio, less dry gas and coke were produced. Results of commercial application show that in MIP-DCR process the reactions of protonation cracking and thermal cracking are suppressed somewhat, thus the yields of dry gas and coke reduce by 15.58% and 4.10%, respectively. At the same time, the yields of LPG and gasoline increase slightly, the energy consumption is lower too. Moreover, in MIP-DCR technology, since it is not restricted by the unit heat balance, taking catalyst to oil ratio as an independence variable, more flexible operation modes can be adopted. Besides, the blending efficiency of regeneration catalysts with different temperatures in a pre-lift mixer was modeled by CFD software as well.