In recent years, composites with nonlinear dielectric or resistive properties exhibited good performance in homogenizing electric field and space charge suppression, which provide a new method to reduce the accelerated aging problem of insulation materials under inhomogeneous field in high voltage transmission and distribution system. For the purpose of obtaining insulation materials with desirable dielectric and electrical resistance properties, electrical properties of nonlinear fillers doped silicon rubber composites and its dependency of temperature and field were investigated in this study. By choosing barium strontium titanate (BST) and zinc oxide (ZnO) as the filler and high temperature vulcanized silicone rubber (SiR) as the matrix., the samples of silicone rubber composites with different components were prepared respectively. Experimental investigations into the electrical properties of silicon rubber composites at different filler loadings revealed few unique behaviors (at certain filler loadings) and also advantageous characteristics. Results demonstrated that it was possible to achieve higher values of permittivity and lower values of tanδ and resistivity with respect to unfilled silicone rubber composites over a wide electrical strength range.,which verified the prospect of the application of non-linear composites in high-voltage insulation.