C9 petroleum resin is a kind of thermal plasticizing hydrocarbon resin produced by C9 fraction, by-products of petroleum cracking, through pretreatment, polymerization and distillation. Paints mainly use C9 petroleum resin with high softening point, C9 petroleum resins are added to paints can increase the final finishes of paints, the adhesiveness of paint films and the hardness. Resistance to acid and alkaline. Rubber Industry mainly use C9 petroleum resin with low softening points, this resin have very good mutual solubility with natural rubber particles, No affect to the sulphurization of rubber. Petroleum resins have very good adhesiveness; they can increase the adhesiveness of adhesives, resistance to acid, alkaline and water. Subsequently they will reduce the production cost. Usually, the C9 petroleum resin which have high softening point are used for printing inks, they have color spreading, fast dry and brightening effects and will increase the printing property. C9 petroleum resin has certain unsaturation property and can be used as paper glutting agents, plastic modifiers etc.