Abstract: ABSTRACT: Reinforcement of calcium carbonate on silicone rubber was discussed in detail at particle sizes, surface performance. The reason was analyzed through isotherm of stress-strain and DMAT. It was thought that the mechanism of calcium carbonate composite particles reinforced silicone rubber was not the same as calcium carbonate treated by fatty acid reinforced. The role in silicon membrane and the rubber takes effect mainly between calcium carbonate composite particls and rubber matrix. Calcium carbonate composite particles are suitable for high-modulus structural adhesive because their resistance displacement ability is better than others. Keywords: silicone rubber; calcium carbonate; reinforceing