Introduction GENERATION The nanoparticles are in great demand in the world, new generation methods of nanoparticles are on creation or development stage - Catalytic Chemical Vapor Deposition, Explosion, Electro-Explosion (EE), Mechanical Milling, Sol-Gel, Wet Chemistry and other. The experiments to generate nanoparticles of iron (Fe) and copper (Cu) by EE using low voltage and high energy excess impulses was performed. The interval of nanoparticles size of 30...50 nm was found by Scaning Electronen Microscopy (SEM) method, or high oxidation rate was found using X-ray Diffraction (XRD) method. Result and Discussion Aim - to investigate sizes and composition of nanoparticles obtained by EE method using low voltage and high energy surplus. Objectives: produce Fe and Cu nanoparticles using large than 0,3 mm in diameter wire, and assess particle size and composition by SEM and XRD methods. Methods: Cu and Fe nanoparticles obtained in air (at 105 Pa pressure) using EE equipment (5 kV, 0,2 mF, 2500 J). Particles separated from the aerosol flow with gravitational settler and 3 step centrifugal cyclones. Results: produced Fe/FeO and Cu/CuO nanoparticles was as dense, dark, friable mass. Single particle was spherical in shape (Fig. 1). Cu particles are less trend to agglomeration than Fe, agglomerated particles range from 1 to 7 mm. Contamination of separated nanoparticles (Ø20...80 nm) by individual large particles (250 ... 400 nm) is caused by non-stable air flow and formation of agglomerates. Particles Ø50 ... 80 nm size (in some cases micrometric) were collected in the settler, wich is operating by gravitational princple. It collects about 10% of all particles. Cyclones collect particles from 20 to 60 nm size and some up to 80 nm size. Results of XRD show only a small amount of pure metals (Fe, Cu). It was estimated that dispersion of diameter of nanoparticles obtained after separation was lower as compared with that obtained by other investigators [Kwon et al. 2008; Sabari Giri et al. 2004]. The main formative parameter of nanoparticles is the diameter of wire [Kotov Yu.A.; 2003].