这是作者多年来的研究成果。本文针对利用在实验室的条件下测得的保温材料导热系数计算的保温厚度，往往达不到绝热工程预期的设计与节能效果的问题，引进了实用保温厚度概念与各种修正系数，对保温厚度计算进行了修正．并推荐散热损失法作为基本的计算方法．以期引起同行们的注意与进一步的探讨。 This is the author’s research over the years. In this paper, the insulation thickness calculated from the thermal conductivity coefficient of the thermal insulation material measured under the laboratory conditions often fails to meet the design and energy saving effect expected in the thermal insulation project. The concept of practical thermal insulation thickness and various correction coefficients are introduced to the thermal insulation. Thickness calculations have been corrected. And the heat loss method is recommended as the basic calculation method. In order to attract the attention of colleagues and further explore.