本文讨论了辐射温度计的视场和温度分辨率与光学系统的两个参数f’和F值的关系.对于非调焦系统,光学系统参数主要由视场决定;温度分辨率由仪表放大器的灵敏度决定.对于调焦系统,光学系统参数可由视场和温度分辨率共同决定.文中给出了辐射温度计光学系统设计的一般方法. This article discusses the relationship between the field of view and the temperature resolution of the radiation thermometer and the two parameters f ’and f of the optical system.For non-focusing systems, the parameters of the optical system are mainly determined by the field of view; the temperature resolution is determined by the sensitivity of the instrumentation amplifier For the focusing system, the parameters of the optical system can be determined by the field of view and the temperature resolution.The general method of the design of the optical system of the radiation thermometer is given in this paper.