Basic principle and merits of fiber Bragg grating (FBG) are introduced. A novelty strain sensor and a temperature sensor with FBG technology are presented. Theoretical and experimental analyses of FBG sensor are implemented. The variations of temperature and strain profiles during curing process are experimentally explored by embedded FBG sensors. However,the thermal drift of FBG strain sensor should be considered during the strain measurement. The experimental results indicate that application of FBG sensor on monitoring the composite in curing process is suitable.