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The results of ac conductivity measurements carried out on ceramic samples of Li2O and NiO-Li2O-doped beta'-alumina with Na(x),Ag(+) and Na(+)-Ag)+) mobile ions are presented. The modifications of doping only slightly influenced either bulk or grain boundary conductivity in Na beta'-aluminia. The activation energies of conduction in Na beta'-alumina equal to 0.28 eV at low temperatures decreased to 0.14 - 0.15 eV at temperatures above 200 Cel. The Arrhenius plots for Ag beta'-alumina were found to be linear in whole 20 - 450 Cel temperature range with the activation energies opf 0.19 eV (Li2O) and 0.24 eV (NiO-Li2O). The conductivity measurements done on partially exchanged samples revealed the presence of the mixed alkali effect.