Er3+/Pr3+ co-doped soda-lime glass thin films have been fabricated using RF magnetron sputtering method and their structural and optical properties have been studied. Deposition rate, crystallinity, and composition of glass thin films were investigated by scanning electron microscopy, transmission electron microscopy, and electron probe micro area analysis. Refractive index, birefringence and binding characteristics have been investigated using a prism coupler and x-ray photoelectron spectroscopy. Er3+/Pr3+ co-doped soda lime glass thin films were prepared by changing substrate temperature (room temp.∼550 ), RF power (90W∼150W), and Ar/O2 gas flow ratio at processing pressure of 4mTorr. Glass thin films could be obtained at the optimized processing condition at 350, RF power (130W), and gas flow (Ar:O2=40:0) with maximum deposition rate of 1.6νm/h. Refractive index increased from 1.5614 to 1.5838 and birefringence increased from 0.000154 to 0.000552 as the content of Pr3+ increased. Binding energy of Pr3d increased as the content of Pr3+ increased.