C5 petroleum resin is a certain petroleum resin applicable for hot melt road paint, which can enhance the tenacity, rigidity and adhesive force of dope and form smooth paint surface, and also keep the stable state of the resin in the all seasons, and have a better mixing with rosin-like resin by adding auxiliary agent. In the mixing of top-grade paint, it can form such features as water-proof, anti-ultraviolet radiation, anti-chemicals, and improve the brightness adn dryness of the surface.