To meet the demanding requirements of land and ocean observation under harsh and hazardous conditions, a compact, cost-effective, high-precision interferometric miniature Synthetic Aperture Radar(MiniSAR) system tailored for low, slow and small(LSS) platforms is proposed. Leveraging the unique characteristics and advantages of LSS platforms, the imaging modes, parameter design, and system architecture of the MiniSAR are discussed. In addition, the key technical challenges inherent to the MiniSAR system are analyzed, classified, and thoroughly evaluated. The findings provide both a theoretical foundation and technical support for system development, while offering valuable guidance for the design of lightweight, low-power MiniSAR solutions.