Abstract: Several deasphalted oil samples were obtained from vacuum residuum and FCC slurry oil deasphalted at continuous propane deasaphalting pilot equipment. Their catalytic cracking performances were investigated using a heavy oil micro-reaction apparatus at the condition of reaction temperature: 510 ℃, catalyst to oil ratio: 5.5 and space velocity: 15 h－1. The experimental results showed that the product distribution and selectivity of the deasphalted oil from vacuum residuum was better than that from gasoline while the deasphalted oil from FCC slurry oil was worse than gasoline. Meanwhile it was found that the catalytic cracking property of the deasphalted oil from vacuum residuum became worse with increasing its yield.