Ternary complexes of Copper (II) with different amino acids have been prepared, in which proline taken as a common ligand and valine or threonine taken as secondary ligand. Amino acids have the tendency to form complexes with different metals and have important significance in biological and pharmaceutical fields. The complexes have been characterized by elemental analysis, magnetic measurement, thermal analysis, ESR, IR, XRD spectral studies. A distorted octahedral structure has been proposed for all the prepared complexes.