从传感系统结构的角度分两方面介绍了光纤激光拍频传感技术的研究进展：一是超短腔偏振光纤激光拍频传感系统，利用激光谐振腔生成的两个正交偏振激光，阐释了正交偏振拍频传感器的技术原理及其波分复用、频分复用、波分/频分混合复用等大规模传感器阵列技术。另一个是较长谐振腔的多纵模光纤激光拍频传感系统，介绍了直腔型和环腔型两种传感原理，以及结合波分复用、频分复用、波分/频分混合复用等技术的光纤激光拍频传感网络，实现了传感的大规模网络化。这些传感器将在环境监测、地震勘测、大型土木工程健康监测、水声检测、航天航空等领域具有广阔的应用前景。

The current research progress of optical fiber laser beat frequency sensing system is introduced from the structure of sensor system. One is the ultra-short cavity polarized fiber laser beat frequency sensing system, which uses the two orthogonal polarizations laser generated by resonant cavity to theoretically explain the orthogonal polarization beat frequency sensor technology and its wavelength division multiplexing, frequency division multiplexing, wavelength／frequency division multiplexing and other large-scale sensor array technology. The other is longer resonant cavity of the multi-longitudinal mode fiber laser beat frequency sensing system, and the sensing principle of the straight cavity and ring cavity is introduced. The large-scale sensor network has been achieved due to the fiber laser beat frequency sensor technology combined with wavelength division multiplexing, frequency division multiplexing, and wavelength／frequency division multiplexing technology. These sensors will have wide application prospects in environmental monitoring, seismic survey, large scale civil engineering monitoring, underwater acoustic testing, aerospace field and so on.