The authors summarize the development of the in-orbit real-time information processing (IORTIP) technique, and analyze the imperious demand of this technique for the optical micro/nano satellite used for remote sensing. The restriction conditions when the IORTIP technique is applied into the real optical micro/nano satellite system are also discussed, and a general system design frame is proposed. Furthermore, the paper discusses several design schemes for the IORTIP system in optical micro/nano satellites under some typical application scenarios, which can provide references for the prospective applications of the IORTIP technique in optical micro/nano satellites.