The microstructures of materials determine their properties. Micromechanics is one of the effective methods by which the quantitative relationship between the microstructure of the material and macroscopical mechanical properties can be established. In this paper, the mechanical properties of matrix phase from two different MgO-C refractories were predicted by using micromechanics model. Then, the predicted results were explained based on their different microstructures and compositions. It was proved that the method provides a new approach for researching the mechanical properties of refractories.