Based on code division multiple access（ CDMA） technique

demodulate light source utilizing Golay complementary sequences

and demodulate receiving signal using correlation operation. This method has advantages of low inter-sensor crosstalk and high signal to noise ratio（ SNR）. The temperature sensing characteristic of fiber Bragg grating（ FBG） is further researched by experiments on experimental platform constructed based on method.The experimental results show that the linearity of temperature response is good and the system has low crosstalk.