基于Ritchey-Chretion系统，设计了具有三块球面校正镜组件的折反式光学系统，所设计的光学系统焦距为1 000 mm，F数为5，谱段范围为450~900 nm，视场角2.3°，设计结果表明：该系统在空间频率为77 lp/mm时，面中心遮拦为15%时，各视场MTF优于0.47，成像质量达到衍射极限，光学系统畸变量小于0.5%，同时该系统具有结构简单、体积小、重量轻等优点，适合在轻小型空间相机上使用.

With the development of space technology,small satellite will be widely applied.The paper design a catadioptric system base on Ritchey-Chretion system which including three sphere correction lens.The system has a focal length of 1000,F number of 5,and spectrum band of 450~900 nm,and the field angle reaches 2.3°.the result indicates that,MTF reaches 0.47 at 77 lp/mm with 15% central obscure,the quality of image approaches the diffraction limit,and optical system distortion is less than 0.5%.The system with simpler structure,small size and light weight,can be used in light-small satellite.