Abstract: For the sake of the restraint of system background noise, the temperature excursion accumulation, and the anti-Stokes back-scattering intermingled with the Rayleigh back-scattering, an improved demodulation method of Raman temperature sensor is proposed on the basis of signal processing and anti-Stokes back-scattering curves demodulated. The method improves the temperature precision and stability and sensitivity of system and reduces the cost. The measuring results show the consistency with theory and the temperature precision of ±0.1℃.