Abstract: SnS films were prepared by a two-stage process.This process included the deposition of Sn thin films on the ITO-film-coated glass substrates by thermal evaporation and sulphurisation of the Sn thin films in a vacuum system at certain temperature and time.The SnS films have good adhesion to the substrates in the optimum conditions.The films were characterized with X-ray diffraction,scanning electron microscopy and spectrophotometer analysis.It is indicated that the films are SnS of polycrystalline with orthorhombic structure and they are uniform and dense.According to their reflection and transmission spectrum,absorption coefficient in the absorption edge is greater than 5×10⁴cm^-1,and their direct band gap is estimated to be around 1.48eV.The films are suitable as absorption layers of solar cells.