Abstract: Influence factors of long-term storage stability of the Venezuela Orinoco AR visbreaking products were studied by the changes of kinematic viscosity，TAN（Total Acid Number），weight loss，resin and asphaltene contents of visbreaking products in different storage conditions. It was found that the long-term storage stability of the visbreaking products is influenced by oxidative polycondensation, light components' volatilization and non-oxidative polycondensation, among which the effect of oxidative polycondensation is the most significant. Free radical reaction did not terminate after thermal reaction finished. The long-term storage stability of visbreaking products was closely related to free radical. Aromatic carbon ratios of resin and asphaltene of all visbreaking products were lower than that of the original visbreaking product. Asphaltene did not occur polycondensation, so visbreaking products could hardly arise layer phenomenon and was more stable.