Composite material is one of the important materials for lightweight equipment design because of its high specific strength， high specific modulus and good designability. However， the residual strain generated in the curing process of composite materials is one of the main factors that restrict its development and application. It is necessary to elaborate the mechanism of strain variation during the molding process. In this paper， employing the method of embedding fiber Bragg grating （FBG）， real-time monitoring of internal strain and temperature of the T700/C11 prepreg under different curing process is carried out. The influence of curing process on the variation of internal strain is investigated. A numerical analysis model for predicting the residual strain of the laminate is established to optimize the curing process parameters of the composite. The results show that the residual strain can be effectively reduced by reasonably decreasing the heating rate， using the mold with lower thermal expansion and lower thermal conductivity， and avoiding the error of layup.