Abstract: M-5 fumed silica was surface-modified by γ-Methacryloxypropyl trimethoxy silane,the change of surface status about fumed silica before and after treatment was characterized by FT-IR;Modified silica was added to Methyl-block room temperature vulcanizable(RTV) silicone rubber,the mechanical properties of which were tested;Metal and silicone rubber was also treated by silane coupling agent,the water contact angle of which were measured by the contact angle instrument.The FT-IR results showed that silane coupling agent molecular group was grafted on the surface of fumed silica.The mechanical properties tests showed that silica which was modified by silane coupling agent reinforced silicone rubber obviously,the maximum tensile strength value of silicone rubber silica is 2.65 MPa.When metal and silicone rubber surface were treated by silane coupling agent,water contact angle decreases,the adhesion bond strength increases; when the surface of silicon rubber and metal were treated by KH550 and KH560 coupling agent solution,the largest adhesion bond strength can reach 1.5 MPa.