1. Statement of the Problem. The problem of investigating the stress and strain fields in structural elements, taking into account that these fields are stochastic and highly inhomogeneous, is critical when studying the deformation of composites with random structures. This analysis is possible only on the basis of the solution of the stochastic boundary-value problem [1][2][3][4][5] ~=[C0m~(r)~r um(r)]--~ Uilr =e;/r 2, jr. .J (1.1) for example, relative to the field of displacements u(r)in the case of a homogeneous elastic macrostrain ~* over a certain representative region C( r ) of a composite with the boundary F and a statistically homogeneous field of elastic properties C(r ) Let us consider quasi-periodic structures [ 1 ] with inclusions whose shape and size are determinate and whose random distribution over the region V is given by some probability law for the vector a of random deviations of their centers from the nodes of the known periodic lattice. We assume that the inclusions cannot extend beyond the boundaries of the respective cells and the displacements of the inclusions in different cells are independent random events. The elastic properties of the inclusions and matrix are determinate and known: C f and C m are the corresponding tensors of elastic properties. The quantifies related to the periodic structure are designated by p, to the inclusions --by f, and to the matrix --by m.Perm' State Technical University, Russia.