太赫兹波由于其极低的光子能量和对非极性物质较强的穿透特性已成为人体隐匿物检测应用的热点。本文以室内人体隐匿物品探测为主要应用背景，简要介绍了太赫兹波段的大气传播特性; 重点分析了基于辐射检测的室内被动太赫兹成像原理和系统的关键技术，包括辐射计和阵列扫描方式等; 回顾了国内外被动太赫兹成像技术在人体安检领域的研究现状。综合考虑系统成本和成像时间，一定数量的高灵敏度辐射计加上扫描机构成像的方式在未来很长一段时间里将是被动太赫兹成像系统的主流方式。

Terahertz wave has become a hot research point for body hidden objects detection applications due to its extremely low photon energy and the strong penetration properties to non-polar material. In this paper, taking indoor body concealed detection as the main background, we briefly introduce the atmospheric propagation characteristics of THz waveband. Then we focus on the analysis of the indoor passive terahertz imaging principle and the key technology of imaging system based on radiation detection, including radiometer and scanning array mode, and review the research status of passive terahertz imaging technology in the field of human body security inspection at home and abroad. Considering system cost and imaging time, passive terahertz imaging system consisting of a certain number of high sensitivity radiation meters and scanning imaging mechanism will be the mainstream in the future for a long time.