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According to the differences of thermal conductivity of different types and specifications of thermal insulation materials, the reproducibility of different thermal conductivity test equipment was tested, and the influence of the average temperature of hot and cold plate, temperature difference between hot and cold plate, laboratory temperature and drying process on the determination of thermal conductivity was studied. Detailed measures for the accuracy and reproducibility of thermal conductivity measurement are proposed. Compared with the experimental results, the optimization effect is obvious. [ABSTRACT FROM AUTHOR]