Abstract: In response to the high frequency of heat damage, the optimization of design for specific heat protection suits for high temperature workers has become an important research topic. Material selection and combination are essential to the quality of heat protection clothing. This article analyzes the heat transfer model of the heat-resistant clothing based on the control volume method to obtain the recursive law of temperature and time-space change, and establishes an optimized model by recursive law to obtain the optimal thickness of the heat-proof clothing in the specified environment. The law derived from the experiment is consistent with experience and is thus reliable.