The electrical performance of Ga 3+ doping Na0.5Bi0.5TiO3-based oxygen ion conductor was studied. The Na0.52Bi0.47Ti1-xGaxO3-δ (x=0, 0.01, 0.015, 0.02) samples were fabricated by the means of traditional solid-state reaction. The results of AC impedance measurement show that the bulk conductivity of Na0.52Bi0.47Ti1-xGaxO3-δ samples decrease monotonously with the increase of Ga 3+ doping. At 673 K, the bulk conductivity of the Na0.52Bi0.47Ti0.98Ga0.02O3-δ sample is 7.19×10 -4 S/cm, which is lower than that of Na0.52Bi0.47TiO3-δ sample under the identical test temperature. The highest total conductivity emerges in the Na0.52Bi0.47Ti0.99Ga0.01O3-δ sample with 1.387×10 -4 S/cm at 623 K for the Ga 3+ doping content of 1 mol%, which demonstrate that a slight of Ga 3+ doping supports the enhancement of the total conductivity. A relaxation peak was observed in the Na0.52Bi0.47Ti1-xGaxO3-δ compounds. As the Ga 3+ ions were introduced into the Na0.52Bi0.47TiO3-δ compound, there is an increasing trend of the relaxation activation energy educed by the internal friction test. In addition, the oxygen relaxtion height of Na0.52Bi0.47Ti1-xGaxO3-δ samples decreases along with the introduction of the Ga 3+ doping, suggesting that the introduction of the Ga 3+ leads to the decrease of mobile oxygen vacancy .