A temperature sensing measurement system based on fiber Bragg grating(FBG) is proposed,which can be applied to the analysis and research of space temperature field.The system is mainly composed of FBG array,optical fiber demodulator and host computer,which can realize the real-time multi-point temperature measurement in complex environment as well as monitoring and temperature recording of temperature field in the environment.The experimental results demonstrate that the proposed measurement system accurately realizes the real-time temperature measurement of each point in the space.The system has the characteristics of high spatial resolution,fast respond speed and anti-electromagnetic radiation,which provides a powerful means for the study of spatial temperature field and the monitoring of temperature field under special working conditions.