Abstract: The performance of PS-Ⅵ CCR catalyst prior and post to processing high sulfur feeds was compared. It can be seen that running under high sulfur environment, the yield and RON of C5+ liquid product are only slightly lower, which means that PS-Ⅵ catalyst possesses good resistance to sulfur poisoning. When stop using high sulfur feed, the sulfur content of feed decreased, and gradually the sulfur content of catalyst could be returned to normal level. Moreover, the effect of temporarily sulfur poisoning on catalyst activity and service life is non-significant.