Space all-purpose double-faced reflective mirror is a key optical component of a certain spaceborne hyper-spectral imager.Its design and manufacture technology are important problems which must be solved during the hyper-spectral imager engineering development phase.Firstly,the composing project of double-faced reflective mirror,one face optical reflective surface and the other diffuse surface,is introduced.Furthermore,the structure design and finite element analysis of reflective mirror have been carried through taking into account ratio of diameter and thickness,lightweight form and mounting interface.Based on these works,the manufacture technology of double-faced reflective mirror has been explored,and then the mirror development has been finished.Finally,the double-faced reflective mirror testing devices and the mirror′s testing results are presented.The testing results indicate that root mean square values of the optical surface figure of double-faced reflective mirror is 0.023λ (λ =632.8 nm),the diffuse characteristic is close to the normative diffuser at vertical incidence.The results prove that the space all-purpose double-faced reflective mirror satisfies the requirements of hyper-spectral imager.