针对高空预警探测系统中红外光学系统的需求，在分析大口径光学系统结构特点的基础上，研究了非球面系统的特点，结合两镜R-C 系统结构计算方法，提出系统主要性能指标，并设计了一个符合要求的450 mm 口径红外非球面光学系统。系统采用全非球面的设计，经过系统优化、像差和热差分析。该系统具有结构简单、质量轻、口径大、焦距长、失真小以及良好温度适应性等特点。

Because of the demand for warning detection infrared optical systems, this paper studies the characters of aspheric optical systems based on analyzing the structural characteristics of large aperture optical systems. Combining the design methods of the R-C system, it puts forward the evaluation indexes of the optical systems and designs a 450 mm aperture infrared aspheric optical system which can meet the demands. The system makes up of all aspherical. Through the system optimization, the analysis of aberration and differential thermal, the designed system is simple, light weight, large aperture, long focal, and good temperature adaptability.