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With deep eutectic solvent (DES) as the modifier of silica, the dispersity of silica in styrene butadiene rubber (SBR) was improved by in-situ reaction under the synergistic effect of DES and bis(3-triethoxysilyl-propyl)-tetrasulfide (TESPT). The effects of different types of DES on curing characte-ristics, processing properties, physico-mechanical properties, and micromorphology of SBR/silica composites were researched. The results showed that choline chloride/urea in combination with TESPT could significantly improve the dispersity of silica in SBR matrix and weaken the Payne effect, so the mechanical properties and compression fatigue property of SBR/silica vulcanizates increased. Meanwhile, choline chloride/oxalic acid in combination with TESPT showed outstanding performance in impro-ving the interface adhesion between silica and SBR resulting in excellent wear resistance of SBR/silica composites. However, when the amount of DES was overdosed, the modification effect became worse.