Simple three point bending test at ambient temperature characterized the mechanical behavior of burned Al2O3-C refractories before and after thermal shock in association with the processing parameters (graphite content and coking temperature, etc.). The results showed that non-linear plastic elastic behavior under load lower than cold modulus of rupture (CMOR) was registered in all specimens and real linear elastic behavior could be identified after the first load. The total deformation could be divided into two parts, plastic and elastic areas. The graphite content and joint bonding system of carbon and ceramic phases were responsible for mechanical behavior of Al2O3-C refractories.