【Abstract】 The Tuha vacuum residue(>500℃)was separated into 7 narrow fractions by Supercritical Fluid Extraction and Fractionation(SFEF). The properties of all fractions and the vacuum residue were analyzed, and a characterization index for heavy oil, K H , was proposed to characterize the fractions which were used as the feedstock for FCC. The catalytic cracking reaction was carried out in an elaborately designed reactor system using CC-20D(QD)catalyst. The experimental results showed that SFEF had a good separation efficiency for vacuum residue and the fraction became worse with the increasing of extraction rate for FCC. The industrial way of residue oil for FCC was advanced on the base of the test results.更多还原