The textbook presents the second part of the training materials for the course "Compositional materials". They set out the basics of the theory of forecasting the physical and mechanical characteristics of composite materials of stochastic structure .. The problem of forecasting macroscopic constant thermal conductivity, diffusion and dielectric permeability of stochastically heterogeneous materials has been formulated and solved . Formulas for the calculation of macroscopic constants of different types of composite materials are presented . The influence of component properties and geometric parameters of inhomogeneities on composition properties. On the basis of the considered solutions, laboratory works are developed, presented in the first part and intended for computer modeling of effective characteristics of composite materials in order to predict their physical and mechanical properties and choose the optimal structure.