The temperature change, curing rate and the strain produced by the composite materials under different processes can greatly influence the molding quality of composites. In order to meet the requirements of monitoring the curing process of resin matrix composites under different technological conditions, the fiber Bragg gratings(FBGs) were embedded into epoxy resin under different conditions at the constant temperature of 40 ℃ and room temperature of 24 ℃, respectively. And the curing time was lasted for 18 hours. The results showed that the temperature change, curing rate and the strain during the curing under the constant temperature of 40 ℃ were bigger than these at room temperature of 24 ℃.