Firefighter's thermal insulation clothing is the protective clothing worn by firefighters to protect their own safety when they carry out fire-fighting operations near the flame or strong radiation area.Its thermal insulation performance determines the quality of thermal insulation clothing,and even directly related to the lives of front-line firefighters.Through the research on the combination form of thermal insulation clothing fabrics and layers,a large number of combination tests,combing the test results and summarizing and analyzing,this paper aims to find the best combination model of thermal insulation performance of thermal insulation clothing.The data analysis results can provide reference for the design and production of thermal insulation clothing,so as to effectively improve the thermal insulation performance of thermal insulation clothing.