Fig. 1. Optical system layout

Fig. 2. MTF of optical system（Nyquist）

Fig. 3. Schematic diagram of primary and thiral mirror

Fig. 4. Development process of mirror support system

Fig. 5. Structure diagram of primary and tertiary mirror cell

Fig. 6. Tridimensional model of primary and tertiary mirror

Fig. 7. Schematic diagram of the mirror supporting structure

Fig. 8. Parametric model of flexure supporting

Fig. 9. Deformation results of different parameters at gravity and thermal rise of 4 ℃

Fig. 10. Finite element model of the mirror support system

Fig. 11. Cloud diagram of reflective mirror self-weight deformation

Fig. 12. Cloud diagram of reflective mirror thermal deformation

Fig. 13. Photo of primary and tertiary mirror subassembly

Fig. 14. Scheme of primary and tertiary mirror surface distortion measurement

Fig. 15. Surface measuring result of the mirror