介绍了温度变化对红外光学系统的影响和红外光学系统无热化设计的常用方法。应用CODE-V光学设计软件设计了一个工作于中红外光谱波段的折射式全球面镜无热化光学系统，采用锗、硅和硒化锌3种光学材料，系统镜间材料为铝合金。设计结果表明：在-40℃～+65℃温度范围内，光学系统的成像质量接近衍射极限，且光学系统的出瞳与光栏重合，具有结构简单、体积小、质量轻、成本低等优点，可应用于空间红外光学系统。

The effect of temperature variation on infrared optical system and athermalization technique were introduced. An athermal middle infrared refractive optical system was designed by CODE-V optical design software，which used Ge, Al and ZnSe material. The image quality of the system approached diffraction limit in the temperature range of -40℃～65℃. The exit pupil and stop of the optical system was coincided. The optical system has many advantages，such as simple structure，small volume，light weight and low cost．It can be applied to space infrared optical system.