在局部放电测量中如何区分和抑制干扰信号十分重要，本文利用超宽频带检测技术研究了几种典型干扰信号的超宽频带频谱指纹特征，发现不同类型的干扰信号在时域和频域上有明显区别，并且干扰信号与局部放电信号也有明显区别。利用上述特性，可以在干扰环境下有效地进行局部放电测量。 It is very important to distinguish and suppress the interference signal in PD measurement. In this paper, the ultra-wide band detection technology is used to study the characteristics of ultra-wide band spectral fingerprint of several typical interference signals. It is found that different types of interference signals have time- Obvious difference, and interference signals and partial discharge signals are also significantly different. With the above characteristics, it is possible to effectively measure the partial discharge in a disturbed environment.