Electrophysical properties of Si-polymer composite varistors, which were prepared using hot press method, have been investigated. Research on (I-V) characteristics of samples shows that by Si content exceeding 65% of the whole, samples have varistor behavior with nonlinear coefficient of about 10. Varistor breakdown voltage tends to become low in reaction to increase in Si content. Potential barriers of samples have also been investigated. The results show that increasing Si content decreases their potential barrier. These samples show a low hysteresis compared to other semiconductor-polymer composite varistors. (C) 2014 Elsevier B.V. All rights reserved.