本文详细介绍了采用热电偶测温的基本原理并概述了热电偶的分类方法。为了实用的目的,对热电偶的均匀性、不稳定性和重复性之间的关系做了阐述,并对这三者的测定方法做了介绍。对热电偶的安装和使用条件提出了具体要求。文中分别绘出了分度热电偶用的两种恒温器的结构示意图,对其性能做了比较讨论。利用上述两种恒温器分度了若干国产材料热电偶,实用温区分别为4.2—293K,20—293K This paper describes in detail the basic principles of thermocouple temperature measurement and outlines the thermocouple classification method. For practical purposes, the relationship between the uniformity, instability and repeatability of the thermocouple has been elaborated, and the determination methods of the three methods have been introduced. The thermocouple installation and use of the conditions put forward specific requirements. The paper respectively draws a schematic diagram of the structure of two kinds of thermostat used for indexing thermocouple, and makes a comparative discussion of its performance. Use of the above two thermostat indexing a number of domestic materials thermocouple, the practical temperature were 4.2-293K, 20-293K