Abstract: Milled ionic liquid-expanded graphite (IL-EG)/room temperature vulcanized silicone rubber (RTVSR) composite was successfully prepared. In order to investigate the role of IL, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6), modified fillers on the electrical properties and thermal character of SR composite, XRD, SEM, TEM and some other test methods were used. The results demonstrate that EG is successfully exfoliated into single layer graphene with the aid of IL.It confirms the presence of ionic liquid on the surface of graphene. Graphene is uniformly dispersed in the SR composite with the modification of IL, which facilitates the formation of conductive net work and decreases the volume resistivity of composite.