将光学系统设计与杂散光分析相结合，介绍了一种焦距2000 mm、F/#＝10、2ω＝1.66°的空间用R-C光学系统，系统像质优良，结构紧凑。同时，针对R-C系统的特点，考虑轴外渐晕的影响，计算了主、次镜内遮光罩的尺寸，给出外遮光罩的设计方法，对该R-C望远镜系统进行了遮光罩设计，并用光学软件进行杂散光分析，计算得到方位角为0°时的PST曲线。结果表明，当离轴角度大于太阳临界入射角时，PST值小于10－8量级，满足要求。

Combining optical design and stray light analysis, a kind of R-C optical system used in space was introduced. The system had an effective focal length of 2000mm, an F-Number of F/10, and a field of view of 2ω＝1.66°. The system had high image quality and compact system structure. Meanwhile, the size of primary baffle and secondary baffle was calculated when basing the characteristic and taking account of vignette of R-C system. The design method of outer baffle was given. The method was used to design a baffle for this R-C telescope system, and the true stray light condition was simulated with optical ray trace software. According to the simulated datum, the PST curve at azimuth 0° are drawn, and the curve shows that PST values are 1ess than 10－8 when off-axis angles are larger than the solar critical angle which satisfies requirement.