Abstract: Although great progress has been made in the research field of target electromagnetic scattering characteristics at home and abroad, there are still some difficult problems for the technology itself. At the same time, the applications, such as for low scattering target detection and recognition in complex environment and new radar system development such as Terahertz radar, put forward a new demand in the research of target electromagnetic scattering characteristics. According to the requirements of these new technologies and applications, this paper summarizes several hot topics and difficult problems from three aspects, scattering modeling, scattering measurement and signature extraction. This paper is expected to provide some directional guidance for researchers in this field.