IR, WAXS and EXAFS arn used to study the structure of the non-crystalline io nic conductors in the Li2O-Nb2O5-SiO2 system. From the analysis, it is known that Nb5+ ions exist mainly as (NbO6) in the non-crystalline network. The non-crystalline structure varies with Nb2O5 content, it consists of polycyclics formed by shared side (NbO6) and (SiO4) when Nb2O5 content is. low, and shared of apex (NbO6) when Nb2O5 content is higher. The results of conductivity measurement are used to study the relations of the structure and electrial properties. The non-crystalline material with about Li2O 0.45 and Nb2O5 0.3 has the highest conductivity.