In order to realize temperature-stable fiber Bragg grating (FBG) sensing demodulation, a calibration method of real-time composite wavelength references using Fabry-Pérot (F-P) etalon and acetylene gas cell is proposed. The temperature drift properties of F-P etalon transmitted spectrum and acetylene gas cell absorption spectrum are analyzed. The experiment system is developed to test temperature drift property of F- P etalon transmitted spectrum. The experiment shows that the average temperature sensitivity of F-P etalon spectral line is 1.16 pm/℃ and the temperature repeatability error can be up to 13.0 pm. Temperature stability of demodulation both using F-P etalon as wavelength reference and composite wavelength references is studied. The experimental results show that under temperature cycle from 0 ℃ to 55 ℃, the range of variation using single wavelength reference is ±32.7 pm, and the standard deviation is 20.7 pm. However, the range of variation using composite wavelength references can be ± 1.2 pm, and the standard deviation is 0.39 pm. The temperature stability of variation range increases 27 times.