The composition dependence of the magnetic moment of atoms in the amorphous {ital R}-{ital T} thin films (where {ital R}=Nd or Pr and {ital T}=Fe, Co, or Ni) was studied at very low temperatures. It was found that the magnetic moment of the Pr atom was reduced in the alloys, and the difference of the magnetic moment between the free Pr atom with valence 3 and the Pr atom in these alloys was in the range of (0.49--0.66){mu}{sub {ital B}} for all of the alloys. It is suggested that the Pr ion is not in the ground state in Pr-Fe, Pr-Co, and Pr-Ni amorphous alloys at very low temperatures.