Abstract: Thermogravimetry was used to study the non-isothermal thermolysis and coke formation trend of Kuwait and Saudi Arabia vacuum residues, as well as their four components. Some basic characteristics of their non-isothermal thermolysis were obtained. It was found that the existence of saturate and aromatic components could promote the thermolysis activities of resin and asphaltene, meanwhile, the thermal stabilities of resin and asphaltene were higher than those of saturate and aromatic components. The non-isothermal thermolysis of Kuwait and Saudi Arabia vacuum residues, and their four components could be divided into two temperature ranges, and in each range reactions followed the first-order kinetic model. The activation energies in these two ranges were varied significantly; furthermore, the activation energies of the components were different from each other even in the same temperature range.