Abstract: The effect of five typical heat treatment technologies on the damping properties and the damping peak of the SiC_P/6061Al MMC, fabricated by spray atomization and deposition, was studied. The results show that the internal friction spectra of various heat treated samples exhibit the internal friction peak versus temperature between 150℃ and 200℃. Furthermore, the peak temperature and the peak height increase with increasing frequencies. By Arrhenius equation we can get the active energy of the damping peak, which is above 1 eV. On the other hand, different quenching treatments affect the damping peak remarkably; when the rate of cooling is above water quenching, the damping peak will shift to a higher temperature while enhancing the cooling speed.