SnS thin films on tin oxide transparent conducting glass substrates were prepared by electrodeposition method from aqueous solution containing SnCl 2 and Na 2S 2O 3.The mechanism of electrochemical co deposition of tin and sulphur was explored,and the influence of fabrication condition(such as the concentration ratio of SnCl 2 and Na 2S 2O 3,pH value and electric current density) on the structural and optical properties of the films was also studied.The samples were characterized with XRD,SEM and optical measurements.The as deposited films are of polycrystalline with orthorhombic crystalline structure and grain size of about 150 nm.The optical direct band of 1.36-1.73 eV can be adjusted by changing the deposition parameters.