Abstract: The internal friction in low carbon aluminium killed DC01 automobile steel sheets, which are of normal without superlower yield point, and of inhomogeneous stamping deformation containing Lüders bands and/or orange skin, were measured from room temperature to 350°C. It is found that for the automobile sheets with different stamping performancies their mechanical spectra have obviously different characterstics. There is a mechanical spectrum with three small peaks for the normal sheet, and there appears a doublepeak spectrum in which the two peaks are all obviously high for the sheet with Lüders bands, and there is a multipeak spectrum having 4 to 5 very small peaks for the sheet with orange skin. The discussion on the nature of the damping peaks and the characteristic of the mechanical spectra was made.