Abstract: Depending on the rapid development and technological strength, space-borne synthetic aperture radar (SAR) satisfies the requirement of high resolution wide-format imaging, high precision mapping, and ground monitoring, which has important value in science, military and business. In this paper, the status quo of development and application of space-borne SAR is summarized, the key technologies in artillery reconnaissance are discussed, the strengths and weaknesses of related technologies in application is analyzed. Through analysis and summary, the authors believe that with the continuous innovation of space-borne SAR technologies and the continuous advancement of engineering and practicality, it will be able to further expand its application field and become a "miracle soldier" in artillery reconnaissance.