Al3O3N nanowires were successfully synthesized by dc arc_discharge in H2+Ar with a little amount of N2+O2 Composition, morphologies, microstructures were characterized using x_ray diffraction, scanning electron microscopy, Trans mission electron microscopy(TEM),and high resolution TEM. The synthesized Al3O 3N nanowires had the diameters ranging from 25 to 110 nm and the lengths up t o 55 μm. Al3O3N nanowires is of a spinel type structure. Besides, the growth mechanism of Al3O3N has also been studied.