Abstract: Temperature is an important physical parameter that needs to be monitored in the operation of power system. Compared with other temperature sensing technologies, temperature sensing based on optical fiber has many advantages, such as resistance to corrosion, anti-interference, low power consumption, fully passive, convenient deployment, etc. Multiple fiber temperature sensing technologies are studied respectively in this paper, including technical principle, development and their suitable application scenarios. The engineering application of optical fiber temperature measurement technology in power system is discussed, the application advantages of different optical fiber temperature measurement technologies are obtained, and the development trend of optical fiber temperature measurement technology in power system is prospected.