( PEO )x- ( V0.85 Mo0.15 )2O5 ( x = 0, 0. 5,1.0) nanocomposite films were prepared by a modified sol-gel method. The structure of the films was analyzed by XRD , and the DC electrical conductivity. Cyclic voltammogram and optical spectral transmittance were investigated. The results show that the ( V0.85 Mo0.15 )2O5 xerogel has a layered structure and its interlayer space increased from 1.3181 mn at x = 0 to 1. 7897 nm at x =1.0. The introduction of MoO3 improved the DC electrical conductivities of the films due to the generntion of V4 +to maintain the electrical neutrality of the oxides. PEO intercalated in the interlayer of ( V0.85 Mo0.15 )2 O5 oxides has interaction with the oxidles, enhancing the amount of Li + iotas inserted into the interlayer of the oxides. Moreover , the intercalation of PEO into the interlayer of ( V0.85 Mo0.15 )2 O5 oxides improved the cathodic electrochromic property in near ultraviolet region and anodic electrochromic property in visible rauge.