Abstract: Ethylene vinyl acetate (EVA) with 18%(mass ratio) of vinyl acetate was blended with silicone rubber (SR) in the mixer, then the other rubber components were added in the roll-milling to prepare un-vulcanized EVA/SR rubber composites, then they were vulcanized to produce EVA/SR viscoelastic damping composites with wider effective temperature range. The effects of different contents of EVA on the mechanical properties, processability, damping characteristics and thermal properties of EVA/SR composites were studied by capillary rheometer, rubber processing analyzer (RPA), DMA and DSC. The results show that adding more EVA can significantly improve the hardness and modulus and tear strength of SR. Meanwhile, the tensile strength and elongation at break are still high remaining within the range of SR application requirements, and EVA/SR is sheared thinner. The compound exhibits distinct Payne effect in strain scanning by increasing its amplitude. The effects of EVA content and vulcanization can be analyzed by Kraus model. EVA micro-cluster is dispersed in chemically crosslink network SR together filled with silica forming multiple structures. SR decreases the crystallization temperature of EVA. EVA plays a significant role in reinforcing and increasing the viscosity of SR. For pure SR, the temperature range is -42~-28℃ when the loss factor is greater than 0.1. In contrast, for 100:40 (mass ratio) EVA/SR, the effective damping temperature range is -23~37℃ corresponding to the maximum loss factor of 0.18 in comparison of 0.125 for pure SR. This obviously widens the effective damping temperature range rendering the shock-absorbing and de-noising applications at higher temperature.