太赫兹时域光谱(THz-TDS)技术是一种新兴的光谱测量技术，是太赫兹(THz)领域的研究热点。传统THz-TDS系统利用步进的时间延迟线进行扫描，并通过锁相放大器获得THz信号。这种方法检测THz信号的速度有限，无法应用于某些要求快速测量的场合。而快速扫描THz-TDS系统可以实现THz信号的快速检测，易于进一步扩大其应用范围。总结介绍了快速扫描THz-TDS系统在国内外的代表性研究进展，对几种实现快速扫描的方案进行了分析比较，并提出了一定的改进方法。

It is noteworthy that terahertz time-domain spectroscopy (THz-TDS) has been pioneered as a spectral measurement tool, which has drawn much attention in the field of terahertz (THz) wave. Conventional THz-TDS systems employ a stepped delay line for their optical delay line scan and utilize lock-in amplifier (LIA) for the acquisition of THz signals. In this approach, the speed of THz signals sampling is too slow to be introduced into some applications which require a high-speed performance. And the THz waveforms can be acquired in rapid scan THz-TDS system. Therefore, numerous practical applications for THz-TDS systems can be entered much more easily. In this review, we describe the technique for rapid scan THz-TDS and illustrate the various implementations of the technique with recent domestic and oversea examples. In addition, an improved method for rapid scan is proposed.