Due to the fragility of bare fiber Bragg grating(FBG),an approach of polymer and copper capillary packaging for FBG is proposed in this paper.The FBG is coated with acrylate.After the second coating,the FBG is packaged into a blank copper capillary.The FBG can expand or contract freely without strain.The second coating protects bare FBG from damage.The comparison of the experimental results between coated FBG and bare FBG indicates that the temperature sensitivity of coated FBG is nearly the same as that of bare FBG.The thin coating thickness guarantees that the coating thickness is uniform and the spectrum of coated FBG has a good shape.The influence on measurement precision of temperature from strain is decreased.The empirical results show that the coefficient between wavelength and temperature is 0.999 29,and the measurement sensitivity is 13.675 pm/℃.The temperature sensor has a good repeatability.