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Effects of silicon element on the load-displacement curves and the mechanical properties of Mg60Cu30Y10 amorphous alloys were investigated using nano indenter II. Results show that the load-displacement curves of Mg60Cu30-xY10Six amorphous alloys exhibit discontinuous serrations during nanoindentation, which corresponds to the formation and propagation of individual shear bands. And the loading curves become smoother and smoother until the serrations disappear with increasing of the silicon content. And the serrations of Mg60Cu30-xY10Six bulk amorphous alloys disappear gradually with the increasing of loading rates and strain rates. However, the mechanical properties of Mg60Cu30-xY10Six bulk amorphous alloys are not improved determinately with increasing of the component content and quantity