It is shown that the corrective coefficients k_x, k_y which take into account the influence of tangential stresses distribution along the plate thickness exist, when the theory of plates is build by hypothesis only for displacement.
   In the case of tangential surface loading action the expression of coefficients k_x, k_y contents the intensity of this loading, and because of it the relations between transversal force and corresponding shears which remain lineary, are stopped to be directly proportional.