Abstract: SnS films were prepared by constant current cathodic electrodeposition.Influences of elec-trodeposition parameters,such as the pH of the electrolyte,concentration ratio of Sn²⁺ and S₂O₃^2- ions,and current density,on the composition of the films are investigated.The experiments show that the best electrodeposition conditions for SnS films are pH =2.7,Sn²⁺:S₂ O₃^2- =1:5,J=3.0mA·cm^-2, t=1.5h.The film with the composition of Sn_0.995 S_1.005 was prepared,and it was characteriz ed with XRD and SEM.The as-deposited film is polycrystalline with orthorhombic structure and grain sizes of 200-800nm.The transmittan ce and absorption spectrum of the film were measured,and it is found that the transmittance is lower in the spectra of 400-900nm,but it is higher at the wavelengths larger than 1000nm,and the re is an ob vious absorption edge in the vicinity of 950-1000nm.