In this paper we use the DC reactive magnetic with ion source sputtering system to deposit the high packing density and smooth interface Anti-Reflection (AR) films at 80℃. And we use the AR Coating on the B270 glass substrate to improve the visible range of lights transmittance average from 91.2% advanced to 95.2%. By using atomic force microscope (AFM) to identify the surface of the sputtered Nb2O5 films, we found that films’ roughness is 0.185nm.