In this paper we try to describe the possibility of different wavelengths storage in Ag-AgCl thin film by irradiating laser beams, regardless the incident beam is polarized or nonpolarized. Indeed, the changes in the size and interparticle spacing of silver nanoparticles, which are on the surface of this irradiated thin film, makes it possible to store different wavelengths in this thin films. The outstanding point about Ag-AgCl thin films is that, as long as these thin films are kept in a dark space, stored information are stable; but whenever the samples are irradiated by white light like sunlight, the recorded information would vanish. This fact makes it possible to construct reversible memories by Ag-AgCl thin films.