Aiming at the problems that the backscattered light of the temperature signal is weak, easy to be submerged under the system noise, and the overall cost of the system is high and the volume is large in the distributed temperature sensing(DTS) based on Raman scattering, an embedded DTS using STM32F407 module is proposed. The cumulative average algorithm, wavelet threshold noise reduction algorithm and polynomial interpolation algorithm are used in the system to reduce the influence of noise, improve the signal-to-noise ratio of the system and eliminate the dispersion effect of light. The experimental results show that the overall temperature demodulation fluctuation range of the system decreases from 3.3~5.9 ℃ to 0.3~0.8 ℃; in a multimode fiber about 5 km long, the temperature is 29 ℃, 45 ℃, 60 ℃ and 80 ℃ respectively, the demodulation temperature fluctuation range of the system is within ±1 ℃, and the data processing time of the system is about 60 ms.*通信作者: 杨军(1982-), 男, 工学硕士, 高级工程师, 主要研究方向为光纤传感技术。