Abstract: The thermogravimetric reaction performances of two kinds of FCC slurry from Liaohe Petrochemical Refinery were studied using SDT 2960 Simultaneous DSC-TGA instrument under the protection of nitrogen. The experimental data was fitted by the Coats-Redfern integral method and satisfactory results were obtained. Both of the oil slurry follow the first order kinetics at the low temperature region, and the apparent activation energy were 29.685 kJ/mol and 32.35 kJ/mol, respectively. However, they are consistent with the secondary dynamic model in the high temperature region, and their apparent activation energy were 71.84 kJ/mol and 32.095 kJ/mol, respectively. Cracking reaction mainly occurs at the low temperature region, while condensation reaction does at the high temperature region.