In the rubber industry, silica and carbon black are generally used as a filler. Silica filler shows better dynamic viscoelastic properties than carbon black filler in the rubber compounds. So, it is essential to use silica as filler in order to manufacture fuel efficiency tires. However, conventional styrene butadiene rubber (SBR) shows low compatibility with silica due to difference of polarity between rubber and silica. There are some methods to solve this problem such as using coupling agent and introducing polar functional group in rubber molecules. Introduction of functional group into the rubber molecular chains of random styrene/butadiene copolymers (SBR) can improve compatibility towards inorganic fillers. In this study, DEAEMA-SBR synthesized by emulsion polymerization with DEAEMA as a third monomer, was evaluated for silica-filled tread compound. Then, various properties of DEAEMA-SBR/silica composite such as crosslink density, bound rubber content, abrasion resistance, mechanical properties, and dynamic viscoelastic properties were evaluated. As a results, bound rubber contents and crosslink density of DEAEMA-SBR/silica composites were higher than those of the SBR 1721 composites. Abrasion resistance and modulus at 300% elongation of the DEAEMA-SBR/silica composites were better than those of SBR 1721 composites due to the high bound rubber content and crosslink density. These results are attributed to high affinity between DEAEMA-SBR and silica. DEAEMA-SBR composites showed improved values of tan ä at 0°C by increasing Tg. However, values of tan ä at 60°C and dispersion of silica in DEAEMA-SBR composites was not improved. It is attributed to slow cure rate of DEAEMA-SBR compound at the initial vulcanization. This results are due to the re-aggregation of silica. These results suggests that DEAEMA-SBR can help improve the performance of tire such as mechanical properties, abrasion resistance and wet traction.