This publication presents the model and the modeling results of dolomite ceramics deformation under uniaxial load with respect to the composite structure of dolomite ceramics. The main modelling objective was to investigate the dependence of mechanical properties of dolomite ceramics on the mechanical properties and volume proportions of its components – clay and dolomite, assuming the composite structure of dolomite ceramics. The dependencies of theoretical integral elasticity module and local stress concentration coefficients on elastic moduli and volume proportions of were investigated by means of mathematical experiment, and presented as curves, thus making conclusions about the impact of mechanical properties and volume proportions of components on the expected elastic module and tension/compression strength of dolomite ceramics.