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The modulus of elasticity and coefficients of viscosity of nanocomposite films with various percentages of nanoparticles of Fe and CdS in the matrix of low-pressure polyethylene are investigated. For measuring we used the appropriate resonators with longitudinal or shear acoustic waves loaded by the film under study. The calculation of resonator impedance was carried out by the method of equivalent circuits. By using the least-squares method and variation of modulus of elasticity and coefficients of viscosity of the nanocomposite film the calculated frequency dependencies of real and imaginary parts of impedance of loaded resonator were fitted to experimental ones. Key words: Nanocomposite films, modulus of elasticity, coefficients of viscosity, method of equivalent circuits A. Introduction Over the long time the researchers and designers of the electronic devices have given much attention to finding the new physical principles of creation of the artificial electronic media. At present time the new approaches in creation of such media have become to be possible due to the development of nano-technology. One of the important directions of development of nano-technology is the creation and investigation of nanocomposites based on nanoparticles of metals and their compounds, which are stabilized in the volume of polymeric dielectric matrix [1]. The use of the polymeric materials as matrix stabilizer of nanoparticles opened the new scientific direction, namely the plastic electronics. Earlier [2] it has been shown that the properties of metallized nanocomposite materials depend on the volume concentration of nanoparticles by critical way. The change of the concentration of nanoparticles respectively to polymeric matrix stabilizer significantly influenced on the main parameters of nanocomposite: electric conductivity, complex dielectric permittivity, plasma frequency, etc. The variation of mixture of nanocomposite by the change of type of dielectric matrix, size, composition and concentration of nanoparticles allows to purposefully control the basic physical properties of nanocomposite: electrical, optical, mechanical, etc. But at present time there is not the detailed information about elastic properties of developed polymeric composite nanomaterials. Just recently the paper devoted by the investigation of density, phase velocity, and acoustic impedance of alumina colloidal/polymer composite film has been published. In this connection the paper is devoted to experimental investigation of modulus of elasticity and coefficients of viscosity of some nanomaterials with various concentration of nanoparticles of Fe and CdS in polymeric matrix.