随着 THz成像技术的日益发展，针对设计清晰、实时、高灵敏度、小型化及低成本 THz成像系统还比较困难的问题，从设计 THz成像系统的角度出发，就其在成像方面的特点、工作原理、组成及关键技术(包括 THz光学系统、探测器及信号处理)进行了研究，着重研究了目前 THz成像系统的新进展。并分析比较了电磁波段中 γ、X、紫外、可见光、微光、红外、 THz及毫米波各成像系统的优缺点及应用。在 THz成像系统的典型应用基础上提出了 THz成像系统未来发展方向。

With the increasing development of THz imaging technology, this article, aiming at the problem which is more difficult to design a clear, real time, high sensitivity, miniaturization and low-cost THz imaging system, from the view of designing of THz imaging system, studies imaging characteristics, operating principle, composition and key technologies (including THz optical system, detector and weak signal processing)and focuses on the current progress of THz imaging system. And the advantages, disadvantages and application of the imaging systems, which include γ, X, ultraviolet, visible, low-light-level, infrared, THz and millimeter wave in the electromagnetic spectrum, are compared and analyzed. Based on typical applications, the future development direction of THz imaging system is proposed. This work plays a significant role in the study and design of THz imaging.