In this paper, the temperature performance of Raman scattering spectrum in a data fiber was studied in theory and in experiment. The optimum system parameters were decided and a distributed fiber-optic temperature sensor (DFTS) system was developed. Theoretical and experimental analyses showed that the temperature response function of the DFTS system is much different from the actual one. A novel signal process method was put forward to improve the system precision. The results of the measurements show an apparent improvement in the performances of DFTS system. The temperature accuracy and the distance resolution reached to $POM@1 and $POM@1 m, respectively. The system is stable and adequate for commercial usage, such as the power industry, the underground tunnel, the subway, the pipe laying, and also for the mission applications, such as the warship and the airplane.
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