A kind of macromolecular coupling agent was synthesized,and the effect of the coupling agent amount to the reinforement of rubber was tested.The testing figure showed a special reinforcement by means of controlling the amount of the coupling agents, especially to the tensile strength,200% (MPa) modules,hardness cross-link density and elongation at break of rubber composites.The coupling agents contain more sulfur is better. Rubber composites comprise the coupling agents have more anti aging than comprise "Si69".
