Thermal shock tests of fired monolithic refractories with different physical properties were conducted and the degree of cracking was indexed by using the digital image correlation method. In the three kinds of temperature conditions of 600 ℃, 1050 ℃ and 1500 ℃, the thermal shock resistance was correlated with the physical properties of refractories. At the conditions of 600 ℃ and 1050 ℃ fracture energy, modulus of rupture and thermal expansion coefficient were strongly correlated, then static elasticity, fracture energy and thermal expansion coefficient controlled the thermal shock resistance at the condition of 1500 ℃. For the most severe condition of 1500 ℃, the relationship between the test result and various thermal shock resistance parameters was also examined. Using the reciprocal of the crack stability factor 1/Rst as an explanatory variable, relatively strong correlation was obtained with a regression equation of the crack index.

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