C9 petroleumresin is abyproductofethylene plant, carbon ninedistillateas raw materials,lowmolecular weightpolymericobtainedsolid orviscousliquidpolymer. Since the presence of the halogen atom and olefin during the synthesis, which cause thermal stability and resistance to oxidation of C9 petroleum resin deterioration and reduce compatibility with other solvents, the uses of C9 petroleum resin are limited. Hydrogenation of petroleum resin is a good way to handle with the problem. After the hydrogenation, the heat and color resistance of the petroleum resin are improved,Chromanumber reduce from 8-10# to 1-0#, and the miscibility with styrene is also better, though softening point decreased from 120 to 105~110. Hydrogenation makes petroleum resin more widely used. It has alow acid value, goodcompatibility, low melting point,goodadhesion, water andchemical resistancecharacteristics.Petroleum resinhas an averagemolecular weight between200-4000,having goodpourthickeningandimproving the performance ofthe viscositycoefficient,having good compatibility with oil, grease, syntheticresin and the mixingwith other substances has the ability ofwater resistance and acid resistance.  It has low melting point andgoodadhesion. Therefore it hasa wide range ofuses. It is mainly used for rubber, coatings, adhesives, paper, ink and other fields.