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With the development of the Moon exploration, the concept of deploying sensors of synthetic aperture radar based on the Moon (Moon-based SAR) to fully and constantly observe the Earth is gaining increased attention. The Moon-based SAR has the advantages of long-term, large-scale and continuous observation, and it may provide a new way for macro-scale solid Earth monitoring. Here, the system parameters theoretically are analyzed and simulated considering at the requirements of large-scale Earth observation. In addition, the actual relative motion parameters of the Earth-Moon system and the performance of the Moon-based SAR imaging are taken into account. The results show that the Moon-based SAR has the potential of ultra-wide observation applications. It can form an imaging swath of thousands of kilometers by using multi-beam SAR with good imaging performance. [ABSTRACT FROM AUTHOR]