A silane coupling agent is a silane coupling agent and silicone compound composed of an organic material. Molecules of the silane coupling agent having an inorganic material capable of chemically binding to, and capable of chemically binding to organic materials of two or more different reactive groups. Features quality composite resin and the silane coupling agent to improve the dispersibility of the primer when stirred, while improving the mechanical strength of the composite material, water resistance, cold resistance, transparency, adhesiveness, and other properties. Modified resin by reaction with the resin, a silane coupling agent can improve the adhesion of the organic resin material and a given temperature, low moisture curing, and improving weather resistance, heat resistance and acid resistance, solvent resistance.