Abstract: Catalyst of CCR unit in Refinery of Lanzhou Petrochemical Company was separated and graded by physical separation technology based on catalyst density. The recovery rate of usable catalyst (coke content less than 5.8%) reached 91.79%, not only some nonporous beads were sorted out, but also catalyst particles could be graded according to the amount of coke deposited on the catalyst. The commercial operation results showed that the reuse of usable catalyst could meet the demand of reaction and regeneration.