Nanocomposites with high electrical conductivity are being highlighted in recent years, due to their potential applications such as the electromagnetic (EMI) shielding, energy harvesting and sensing materials (Han and Lu, 2009; Gohardani et al., 2014). The conductivity pathway is the most influential factor to determine the effective electrical performance, and it particularly depends on the air porosity in nanocomposites (Kalaitzidou et al., 2007). Herein, the parametric effects of air porosity on the electrical properties are investigated through micromechanics-based simulations (Yang et al., 2016). In the present model, the air porosity are described as spherical voids, and the material properties of constituent phases are properly applied for the numerical simulations in order to capture the experimental conditions (Lee et al., 2014; Yang et al., 2016). The simulation results reveal that increase in the air porosity adversely influences the electrical performance of composites, which can cause an overall electrical degradation of nanocomposites (Yang et al., 2016).