Abstract: ZnS quantum dots have been synthesized via chemical bath deposition (CBD) method. From the x-ray diffraction pattern we can observe the structure of ZnS QDs as the zinc-blende structure. TEM image shows the formation of spherical ZnS QDs. According to UV_visible spectra analyses, a large blue shift is observed which can be attributed to quantum confinement effect of the ZnS QDs. In its PL spectra measurement, the dominant emission band at peaks 438 and 521 nm are identified with optical transitions arising from vacancy and interstitial sites for both Zn and S atoms.