Abstract: Nonlinear conductivity dielectric is widely used today to solve high energy discharge problems in many fields (such as spacecraft charging and motor insulation). In this paper, we optimize the nonlinear conductivity properties and other electrical properties of the composites by continuing the addition of zero- or one-dimensional ZnO to the micro-nano composite systems containing micron SiC and montmorillonite (MMT). The layer spacing before and after the organic modification of MMT was characterized by X-ray diffractometry. The dispersion of each filler inside the composite and the interfacial state were characterized by scanning electron microscopy. Conductivity, breakdown, and dielectric spectroscopy tests were performed on the composites to investigate the pattern of influence of the dimensionality of the nanofillers on the electrical properties. The experimental results showed that the addition of one-dimensional four-needle zincoxide (T-ZnOw) was more effective than zero-dimensional granular ZnO in the MMT-SiC/EP composite system. Thus, the same content of T-ZnOw can increase the interfacial recombination rate in the composite system and constitute the conductive pathway more effectively. Improved nonlinear conductivity properties of the composite. Moreover, T-ZnOw also ensures stable breakdown field strength of the composite material and reduces the relative permittivity and dielectric loss angle tangent values.