Hydrogen permeabilities of amorphous Pd(1-x)Si-x (x=0.15, 0.175, 0.2) alloys in the form of ribbon, which were prepared with a single roller spinning technique, were measured at elevated temperatures up to 390 degrees C, It was found that the hydrogen permeability of the amorphous alloys, strongly depending on the Si content, decreased with an increase in the Si content. The amorphous alloys possessed 3-5 times higher hydrogen permeability than the corresponding crystallized ones. The pressure dependence of hydrogen permeability in the amorphous alloys could be described by the simple n-th power equation, which was derived in this study.