The structural, electronic and D.C electrical properties of,(PVA-MgO-SiC) nanocomposites for antibacterial application have been investigated. The prepared nanocomposites have low cost, flexible and high antibacterial activity. The (PVA-MgO-SiC),nanocomposites were prepared with different weight percentages of Silicon Carbide (SiC),nanoparticles., Electrical properties of ,(PVA-MgO-SiC) nanocomposites were studied with different temperature. The experimental results showed that the conductivity of (PVA-MgO-SiC),nanocomposites is increased with increase the concentration of Silicon Carbide (SiC) nanoparticles. The activation energy of,(PVA-MgO-SiC) nanocomposites decreases with increase the weight percentages of Silicon Carbide nanoparticles. The total energies of the (PVA–MgO-SiC) nanocomposites were studied by using Gaussian 09(G09) program and density functional theory (DFT) with B3LYP/6-31G) basis set. The total energies decreases with the increase the number of atoms forming the nanocomposites,.