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In this research, the viscous-flow behavior of amorphous Mg73.3Cu11.6Pd8.2Y6.9 alloy Was investigated. Thermomechanical analysis experiments Showed that the effective viscosity of the samples decreased with increasing temperature until reaching the steady-state viscous-flow temperature (T-vs) where the effective viscosity of the ribbon sample showed a minimum value and then increased after passing through that point. It vas found that the effective linear expansion coefficient arid the free-volume fraction increased with increasing temperature until T-vs and that the onset of viscous flux decreased with increasing applied stress. It as also confirmed that relative displacement under tensile stress depended Strongly upon the state of amorphicity of the samples.