Ag/Cu2O composite films were fabricated after soaking Cu2O films electrodeposited from an acid electrolyte in AgNO3 solution for a certain time. The structural, morphological and optical properties of the films were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and UV vis diffuse reflectance spectroscopy (DRS). Photocatalytic decolorization of orange II (OII) was used as a probe reaction to evaluate their photocatalytic activity. The obtained Ag/Cu2O composite films had a branch-like morphology, which varied with change in the soak time. Photocatalytic activity and its stability of the Ag/Cu2O composite films were higher than that of Cu2O film. The reason for improvement in photocatalytic activity of the Ag/Cu2O composite films was also discussed. (C) 2013 Elsevier B.V. All rights reserved.