Abstract: The gas-liquid dispersion performance in a self-inspirating tank with dual impellers was studied. In two situations of with and without a stator，the mixing power demand，relative power demand，gas holdup and mass transfer coefficient for different types of impeller combinations were compared. Results indicated that the power demand can be effectively reduced by the self-inspirating tank，the power demand of a combination of 6P-6PDTU is lower than a combination of 6DT-6PDTU，the relative power demand is closed to 1，but the gas holdup and mass transfer coefficient is lower. Hence，the combination of 6DT-6PDTU has a higher power demand and a poor gas-liquid dispersion and mixing，while the self-inspirating gas and gas-liquid mass transfer are better.