In order to realize precise sampling of high-precision distributed temperature sensor, a temperature sensor system based on dynamic oversampling technology of fiber Raman scattering is discussed in this paper. The system realizes spatial dynamic oversampling of Stokes signal and anti-Stokes signal by using the method of dynamic adjusting sampling clock phase shift of field programmable gate array(FPGA). It realizes four times spatial oversampling of 250 MHz sampling clock. The equivalent sampling rate reaches 1 GHz. The method can capture nanosecond scattered light pulses well and has the ability of temperature detection with long distance and high resolution.