This article shows numerical and investigations of ribbed plywood plates with top and bottom plywood flanges and a core of straight and curved plywood ribs. It is possible to vary with stiffness in transverse direction of a plate by changing form of plate’s ribs. This property can be described as structure’s or material’s characteristics of anisotropy or the other results are describable as specific strength or stiffness (stiffness to mass or strength to mass ratio). The numerical simulation of plywood structure is done by using classical linear Kirchoff Love theory of multilayer plate and Finite Element Method. The various results depending on chosen variables (according to strength-stiffness criteria) plywood composite macrostructure is obtained for one span plate with uniformly distributed or 4 point bending loading. The calculations show how to choose the plates dimensions for experimental investigations to obtain results for plate as a structure. All thicknesses of elements are chosen according to plywood supplier assortment. A various thicknesses of plywood sheets are taken for straight ribs as well as various plates’ coverings. All FEM calculations were done by ANSYS software using 3D shell finite elements.