作为电磁波中从红外光到微波的过渡区，太赫兹波所具有的独特性能已得到了人们的广泛认识。随着太赫兹辐射源、 太赫兹探测器等单元技术研究的不断成熟，美国、欧洲和日本已率先将其应用于空间天文观测、深空探测和对地气象环境监测等领域。重点 总结了这些应用中的技术发展情况，并简要分析了太赫兹雷达与通信技术的研究状况和应用前景。

As the transition region from infrared light to microwave in the electromagnetic wave, the terahertz (THz) wave has its unique characteristics which are widely known. With the mature of the unit technologies such as THz radiation sources, detectors and so on, the THz technology has been firstly applied to space astronomical observation, deep space exploration and earth meteorological environment monitoring by USA, Europe and Japan. The development status of the THz technology for these applications is summarized mainly and the research status of THz radar technology and THz communication technology and their application prospects in the future are analyzed briefly.