Ba3MoNb1-xGaxO8.5-delta　(BMNG,　0　＜　x　＜　0.2)　powders　are　successfully　prepared　by　sol-gel　autoignition　method.　The　effects　of　acceptor-type　Ga3+　doping　on　Ba3MoNbO8.5　(BMN)　are　characterized　by　thermogravimetric　analysis,　X-ray　diffraction,　scanning　electron　microscope,　Raman　spectroscopy,　and　electrochemical　impedance　spectroscopy.　All　BMNG　samples　crystallize　as　a　single　phase　in　the　R-3m　space　group　and　show　great　phase　stability　at　various　environments.　Doping　a　small　amount　of　gallium　can　effectively　improve　bulk　conductivity　and　sintering　density　of　BMN.　The　ionic　conductivity　of　Ba3MoNb0.9Ga0.1O8.5-delta　(BMNG10)　is　the　highest,　which　can　reach　2.05　x　10-2　S　cm-　1　at　800　degrees　C.　The　enhanced　ionic　conductivity　is　primarily　related　to　the　increase　of　oxygen　vacancy　concentration　and　the　number　of　tetrahedral　units　within　the　structure.　In　addition,　through　successfully　assembling　and　evaluating　a　single　cell　supported　by　the　BMNG10　electrolyte,　it　is　proved　that　the　practical　utilization　of　BMNG10　in　intermediate　temperature-solid　oxide　fuel　cells　(IT-SOFCs)　is　feasible.　In　short,　hexagonal　perovskite　derivative　BMNG10　is　a　promising　oxide　ion　conductor　for　IT-SOFCs.