Abstract: By using self-made SARA separation device, amounts of SARA were obtained. The adsorbability of SARA was determined by measuring the saturated adsorption amount on the catalyst. The crackability of SARA was carried out in the fixed fulided reactor under conventional reaction conditions (reaction temperature of 500 ℃, catalyst-to-oil weight ratio (CTO) of 6, weight hourly space velocity (WHSV) of 20 h^-1). The results confirmed that the huge differences are existed between the order of adsorbability and crackability of resid SARA. The crackability of saturate is the best, followed by aromatic; the crackability of resin is close to that of aromatic; the worst is asphaltene. Compared to the crackability of SARA, the resin has the strongest adsorbability, followed by aromatic; the saturate is the weakest.