Abstract: Windmill style physical separation technology was applied at the CCR unit of SINOPEC Jinling Company for grading withdrawn CCR catalyst based on catalyst density varied with coke content. Non-porous beads and fine catalyst particles were separated from normal catalyst. After separation, the maximum coke content of the usable catalyst was 4.5%, which is lower than the control index of less than 6%. The low coke catalyst beads were reused in CCR unit and the operation results showed that the reuse catalyst not only well met the requirements of reaction and regeneration, but also shortened the black burning time during the start-up of regeneration system.