The performance data of SiC materials were obtained by processing and polishing SiC and testing its reflectivity

and the advantages and disadvantages of some fabrication methods of SiC mirror roughcast were analyzed. The reflectivity of SiC specimen was tested under different conditions of surface processing including Si-coated or Ag-coated surfaces and Ag-recoated on Si-coated surface with Lanmda-9 Spetrophotometer. The highest reflectivity is 98% under the condition of recoated Ag on coated-Si surface. Domestic long strip SiC mirror was polished and tested. The result shows that the surface roughness is 6.27 nm with Wyko interferometer. As a reflection mirror of off-axis three reflect optics system

the material performance was validated in a mirror surface figure with PV value of 0.068 λ

and RMS of 0.01 λ (λ=632.8 nm)

the results indicate that performance of SiC can meet the requiremerits of the space camera's mirror.