Abstract: A new two-step electro-deposition process was developed to prepare CuInSe₂ thin film absorber for solar cells.Firstly,In₂Se₃ precursor film was electro-deposited on Pt substrate,and then followed by the electro-deposition of CuInSe₂ thin film.The CuInSe₂ film was characterized by X-ray diffraction,scanning electron microscopy and energy dispersive spectroscopy.The annealed thin film is smooth and polycrystalline.The composition of the film is CuIn_1.7Se_2.2,and the contents of In and Se are higher than the theoretical stoichiometry.The CV results indicate that the films are fotmed by introduced co-deposition.