By using terahertz (THz) time-domain spectroscopy to analyze part production processes of traditional Chinese murals, the THz time-domain reflection spectra of each mural production process are obtained. The THz spectral characteristics of traditional Chinese murals in the frequency range from 0.2 THz to 1.0 THz are studied. The THz absorption spectra and refractive index of traditional Chinese murals at room temperature are obtained. The result shows that there is a remarkable difference in the mean refractive index and peak absorption coefficient frequency for each sample. It can provide the reference for the application of THz time-domain spectroscopy in mural information extraction.