Effects of strain amplitude on the room temperature damping capacity of hypereutectic AlSixLa alloys at different frequencies (f=0.5Hz, 1Hz, 10Hz) were investigated. Experimental AlSixLa alloys were manufactured through conventional casting and spray deposition processing routines and their damping behaviors were studied using DMTA instrument. The results show that most of ascasted or asspray deposited hypereutectic AlSi alloys exhibit similar damping behavior (tg) vs. strain amplitude: with the increase of strain amplitude, damping experienced a incubation period initially; fast increase to a damping peak period then, and falling back again period at last. The different additions of La have small influence on the damping capacity of casting AlSi alloys except that the addition of 6wt% La addition obviously deteriorates the damping capacity. On the other hand, the damping peak of spraydeposited Al17Si alloy with the addition of La was evidently higher than that in Lafree Al17Si alloy. Damping capacities of spraydeposited Al17SixLa alloys were higher than their casted counterparts. The damping behaviors vs. strain amplitude of hypereutectic Al17SixLa alloys can be explained by GL dislocation model.