Abstract: Distributed optical fiber Raman temperature sensor (DTS) system is a set of measuring principle of Raman scattering light in optical fiber, based on the distributed temperature monitoring system, which uses Raman scattering light in optical fiber temperature and fiber strength state related principle for real-time monitoring of temperature. A set of 9 km optical fiber Raman temperature measurement system was designed, the Stokes and the anti-Stokes light was collected by data acquisition card, the temperature was accumulated and averaged at the computer terminal, and the weak signal was extracted from the system noise to increase its signal-to-noise ratio.With accumulative average of 16 000 times, the accuracy of temperature measurement can reach to ±2℃.