Nickel nanorod arrays and nanotubes have been successfully synthesized by electrochemical deposition using a polycarbonate membrane template. The length and average diameter of nickel nanorod arrays are 5-6 mu m and 400 nm, respectively. The hysteresis loops indicate that the easy axis of magnetization of nickel nanorod arrays is perpendicular to the membrane plane. By silanizing the PC membrane and increasing the initial voltage, the nickel nanotubes could also be obtained. This method offers a convenient and efficient path to synthesize metal array nanostructures.