In_2O_3 nanowires are fabricated successfully with a high temperature tube furnace.SEM photos show the formation of the nanowires.XRD analyses indicate that the In_2O_3 nanowires are cubic crystals.XPS analyses indicate that there are many oxygen defects in the In_2O_3 nanowires.The In_2O_3 nanowires can emit very bright ultraviolet light at 396nm,which is detected by PL.The emission and reaction mechanisms are discussed in detail at last.