Through the analysis of the intensity ratio of anti-stokes and stokes light of the backscattering light,a multimode optical fiber Raman temperature sensing system had been developed based on Raman scattering and optical time domain reflection principle.Using a new type of dynamic temperature calibration program for fitting low and high temperature zone respectively,which improved the measuring-temperature accuracy up to ±1 ℃.This paper respectively conducted the system temperature resolution,temperature measurement precision,spatial resolution and repeatability experimental verification.The experimental results show that the temperature resolution of 1 ℃,the spatial resolution of 1m,the system stability is good and can adapt to the complex environmental change.