Semiconductor ZnO nanowires embedded in anodic alumina membranes were fabricated by generating alumina templates with nanochannels,electrodepositing Zn in them,and then oxidizing the Zn nanowire arrays. Their microstructures were characterized by scanning electron microscopy and X-ray diffraction spectrum. The results indicate that the polycrystalline ZnO nanowires were uniformly assembled into the hexagonally ordered nanochannels of anodic alumina membranes.