In order to investigate the nonlinear conductivity properties of silicon carbid(SiC)/silicon rubber composites,the DC I-V properties were experimentally measured for the SiC/silicon rubber composites filled with different kind,different crystal structures,different contents and different sizes of SiC.The experiment results show that the conductivity of the SiC/silicon rubber composites increase with increasement of the content of SiC filler,and the conductivity meachinism changed when the content of SiC fil...