Aiming at the strong demand of land and ocean observation with harsh conditions and dangerous environment, a miniaturized and economical high precision interference miniature synthetic aperture radar (MiniSAR) system design scheme based on low slow and small platform is proposed. According to the characteristics and advantages of low speed and small platform, the imaging mode, parameter design and system composition of MiniSAR system are discussed. At the same time, the key technical problems of MiniSAR system are analyzed, sorted out and demonstrated. The research results in this paper provide theoretical foundation and technical support for the system development, and provide a useful reference for the lightweight and low-power MiniSAR design, and have great significance for the improvement of synthetic aperture radar technology in our country and the application of Marine and land observation fields.