In order to improve the damping properties of silicone rubber at high temperature,a silicon intermediate with high phenyl content is added to the silicone rubber and co-vulcanized with silicone rubber using 2,4-dichloroperoxybenzoyl(DCLBP) as vulcanizing agent.Silicone rubber were characterized by the rotorless vulcanizer,SEM,DMA and TG.The results show that with the increasmet of the amount of phenyl silicon intermediate, the degree of vulcanization of silicone rubber,the hardness and tensile strength decrease, while the elongation at break,tear strength and loss factor tanδ at high temperature are significantly improved.When the using amount is 15 parts,the tensile strength of the silicone rubber is 7.75 MPa, and tanδ_max increases from 0.2 to 0.3.