Fast　ion　conductors　of　Li2O　similar　to　SiO2　similar　to　V2O5　system　have　been　prepared　by　using　Li2O,　SiO2　and　V2O5　as　starting　materials.　The　optimal　ratio　of　starting　materials　was　designed　by　Uniform　Design.　The　conductivities　of　both　electric　ind　ionic　were　investigated.　The　highest　ion　conductivity　is　1.5　X　10(-4)　S/cm　at　ambient　temperature　for　the　above　lithium　fast　ion　conductor　system,　the　electronic　conductivity　is　4　orders　of　magnitude　lower　than　the　ionic　conductivity.