Abstract: The signification of using heat insulation technology in a military armored vehicle was discussed. The difficulties and key problems of heat insulation technology in an engine were also analyzed. Based on the semisolid processing theory, material property research method and analogy testing method, hot simulation experiments were carried out to study the distortion rule and quality of cermets, such as TiC-Ni, at high temperature. The broken mechanism of cermets at high temperature was explored. The experimental and research results indicate that non-elasticity strain associate with time in nature according to constitutive equations of the classical elastic-plastic and creep theory. Non-elasticity strain should be expressed by uniform method for it is controlled by the single mechanism. Namely, it should be disposed by elastic-viscoplasticity constitutive equations which associate with plastic strain and creep strain. The mathematical model which can reflect the distortion character of cermets at high temperature was established by multiple regression analysis based on hot simulation experiment data, and statistical test of the mathematical model revealed that the mathematical model is reasonable.