S　doped　ZnS　nanocrystals　were　synthesized　via　hydrothermal　method　by　using　thioacetamide　(TAA)　and　zinc　nitrate　(Zn(NO3)2　·　6H2O)　as　precursors.　X-ray　diffraction　technique　(XRD)　indicated　that　the　as-prepared　samples　were　hexagonal　ZnS　nanocrystals.　The　average　diameter　of　as-prepared　S/ZnS　was　estimated　to　be　about　21　nm　according　to　the　Scherrer　equation.　UV-Vis　diffuse　reflectance　spectra　show　that　the　as-prepared　samples　exhibit　part　of　visible　light　absorption　around　400-600　nm.　The　photocatalytic　evaluation,　via　the　decomposition　of　Rhodamine　B　(RhB)　under　visible　light　irradiation　(λ＞420　nm),　reveal　that　nanocrystalline　S/ZnS　sample　obtained　via　hydrothermal　method　do　exhibit　photocatalytic　performances.