Abstract: Dehydroabietic acid(DA) reacted with 3-glycidyloxypropyltriethoxysilane(GTS) to synthesize dehydroabietic acid-based cross-linking agent(DAG), and then DAG was combined with TiO₂, catalyst dibutyltin dilaurate, and hydroxyl polysiloxane(PDMS) to fabricate the TiO₂ modified dehydroabietic acid cross-linked the room temperature vulcanized silicone rubber(TiO₂-DAG/RTVSR). The microscopic morphology, mechanical properties, thermal stability, and hydrophobicity of the samples were investigated. The results showed that DAG and TiO₂ were uniformly dispersed in the dehydroabietic acid cross-linked silicone rubber. Compared with DAG/RTVSR-3 obtained by only adding DAG, when the addition of TiO₂ was 7%, the tensile strength of the obtained TiO₂-DAG/RTVSR-4 increased from 0.65 MPa to 0.98 MPa which increased by 50.8%, and the elongation at break increased from 250% to 317%.The 5% mass loss temperature of silicone rubber increased from 324.5℃ to 338.8℃ as the addition of TiO₂ increased from 0% to 7%; and the swelling degree decreased, which indirectly reflected the increase in the degree of cross-linking.The contact angle gradually decreased with the increasing of TiO₂ amount. These results indicated that the synergistic effect of dehydroabietic acid with rigid structure and TiO₂ into the molecular chain of silicone rubber could effectively enhance the mechanical properties and thermal stability of room temperature vulcanized silicone rubber.In summary, silicone rubber with 7% TiO₂ had the best performance.