Abstract: By using AC electrochemical deposition，ordered Fe₂₁Ni₇₉ alloy nanowire arrays were fabricated into the anodic alumina oxide（AAO）templates.The nanowires were about 60 nm in diameter and 9.7 μm in length.The morphology，structure and magnetic properties of the Fe₂₁Ni₇₉ alloy nanowires were characterized by scanning electron microscopy（SEM），transmission electron microscopy（TEM），X-ray diffraction（XRD）and vibrating sample magnetometer（VSM），respectively.The results indicated that the nanowires in an array were very regular，with a controllable aspect ratio.Such nanowire arrays were in fcc structure.The hysteresis loops showed that the nanowire arrays had excellent perpendicular magnetic anisotropy with their easy magnetization axis parallel to nanowire arrays.The as-deposited samples had high squareness（M_r/M_s）（about 0.86）and large coercivity（as high as 1203Oe）when the external magnetic field was perpendicular to membranes.Annealing could improve the coercivity and squareness of nanowire arrays.Coercivity increased with temperature and reached its maximum value（1315Oe）at 500℃，then with further increasing temperature coercivity decreased sharply.The change of squareness followed a similar pattern.