We report an enhanced rejuvenation in hot-drawn micrometer metallic glassy wires (MG wires) with the size reduction.Compared to metallic glasses (MGs) in bulk form,the modulus and hardness for the micro-scale MG wires,tested by nanoindentation methods,are much lower and decrease with the decreasing size,with a maximum decrease of ～26％ in modulus and ～17％ in hardness.This pronounced rejuvenation is evidenced by the larger sub-Tg relaxation enthalpy of the MG wires.The pronounced rejuvenation is physically related to the higher energy state induced by a combined effect of severely thermomechanical shearing and freezing the shear flow into a constrained small-volume region.Our results reveal that the inteal states and properties of MGs can be dramatically changed by a proper modulation of temperature,flow stress and size.