Six Q-1 peaks in freshly-worked PbNb2Oa ceramics are observed by low-frequency inteal friction measurementso far as we know for the first time. P1, P2, and P4 appear at the first heating process with remarkable shear modulusanomalies. But they are not observed during the cooling process or in the well-annealed samples. Those peaks areconsidered to be related with the working processes. P3 is a widened Debye relaxation peak in nature. The activationenergy and pre-exponential factor are about 1.0leV and 2.5 × 10-12 s, respectively. This peak is attributed to theinteraction of domain walls and oxygen vacancies. P6 is corresponded with the paraelectric and ferroelectric phasetransition. P5, appearing near Tc, is thought to be caused by the viscous movement of the domain walls.