Order Nickel nanowires arrays with different diameter and length were prepared in the template of porous Aluminum by the means of electro deposition. The morphology and structure of nanowires arrays were characterized and its magnetization hysteresis loops were measured. The results showed that Nickel nanowires deposited in the template of porous aluminum is highly organized and the diameter and length can be adjucsted in the certain scale.Nickel nanowires with the diameter of 10nm and the length of 8μm sh...