A brief survey of works on electrical properties of metal-dielectric nanocomposites with amorphous structure is presented. The concentration dependences of electrical resistance of composites are S -shaped, as follows from the model of percolation theory of conductivity with threshold at concentrations ~ 40-60 at.% of metallic component. The analysis of temperature dependences in temperature range 300 – 973 K showed that in the process of structural relaxation and crystallization of the amorphous phase electrical resistance of composites above the threshold decreases and increases for composites below the threshold. It is found that when the content of metallic phase is below the percolation threshold, in temperature range 77 – 180 K prevailing mechanism of charge transfer is variable range hopping conduction over localized states near the Fermi level. Further increase in temperature is accompanied by the transition of the mechanism of conductivity from Mott’s law: ln(σ) ~ (1/T)^1/4 to the dependence ln(σ) ~ (1/T)^1/2. Magnetic and magnetotransport properties of nanocomposites are also examined.