Nickel (Ni) and cobalt (Co) metal nanowires were fabricated by using an electrochemical deposition method based on an anodic alumina oxide (Al 2 O 3 ) nanoporous template. The electrolyte consisted of NiSO 4 ·6H 2 O and H 3 BO 3 in distilled water for the fabrication of Ni nanowires, and of CoSO 4 ·7H 2 O with H 3 BO 3 in distilled water for the fabrication of the Co ones. From SEM and TEM images, the diameter and length of both the Ni and Co nanowires were measured to be ∼ 200nm and 5–10μm, respectively. We observed the oxidation layers in nanometer scale on the surface of the Ni and Co nanowires through HR–TEM images. The 3MeV Cl 2+ ions were irradiated onto the Ni and Co nanowires with a dose of 1×10 15 ions/cm 2 . The surface morphologies of the pristine and the 3MeVCl 2+ ion-irradiated Ni and Co nanowires were compared by means of SEM, AFM, and HR–TEM experiments. The atomic concentrations of the pristine and the 3MeVCl 2+ ion-irradiated Ni and Co nanowires were investigated through XPS experiments. From the results of the HR–TEM and XPS experiments, we observed that the oxidation layers on the surface of the Ni and Co nanowires were reduced through 3MeVCl 2+ ion irradiation.