A series of styrene-butadiene rubber (SBR) composites based on carbon black, silica and active calcium silicate modified by silane were prepared by melt blending. The effect of modification agent types and quantity, powder supply rate, filler combination on the mechanical properties of the rubber composites were researched. It concluded that: the vulcanizing properties of composites are improved after being filled with active calcium silicate; the vulcanizing torque and curing time are obviously reduced when the composites filled with active calcium silicate cooperating with silica or carbon black which meant better calenderability and production efficiency; the enhancement of active calcium silicate is equivalent to silica and carbon black at low tensile rate. Active calcium silicate partially replace silica and carbon black to reduce the production cost.