The paper features the mathematical model representing the analytical calculation of phonon and electron heat transfer analysis of thermal conductivity for nanofluids. The mathematical model was developed oil the basis of statistical nanomechanics. We have made the detailed analysis of the influence of temperature dependence oil thermal conductivity for nanofluids. Oil this basis are taken into account the influences such as formation of nanolayer around nanoparticles, the Brown motion of solid nanoparticles and influence of diffusive-ballistic heat transport. The analytical results obtained by statistical mechanics are compared with the experimental data and they show relatively good agreement. (c) 2008 Elsevier Ltd. All rights reserved.