TThe field emission property of transparent CdS nanofibers, grown by direct current-sputtering technique on Si and glass substrates, has been studied without using any catalyst or matrix. X-ray diffraction patterns and selected area electron diffraction patterns confirmed the cubic CdS phase formation in the thin films although the initial target material was hexagonal CdS powder. TEM micrographs have confirmed the nanofiber formation with diameters in the range 2 - 4.3 nm and length a few microns. XRD patterns showed the crystal size increased with the increase of deposition time. The Fowler-Nordhiem plots of the emission current from the nano-CdS thin films are almost straight line. The turn-on fields of the grown nano-CdS thin films are found to be in the range 3.6 - 6.6 V/µm. Only bulk-CdS thin film grown on Si substrates have not showed field emission property under the same conditions