The gas holdup in a new self-inspirating gas-liquid stirred tank with dual impellers was studied. The effects of blades angle of gas dispersion channel, stirring speed, medium viscosity and impeller combinations on gas holdup were analyzed. The results showed that when the blades angle of gas dispersion channel was 30°, more gas could be induced at the same speed or inputting power. The gas holdup increases with the increaseed of stirring speed and medium viscosity. The suitable impeller combination was 6SBDT+6PBUT. This combination had a higher rate of gas induction and ability of gas dispersion, and had a higher gas holdup. The relationship between gas holdup and unit volume power consumption was ε∝（P_g/V）^2.4, as the unit volume power consumption increasesed, the gas holdup increasesed signific-antly, the effect of gas-liquid dispersion was better, and the mass transfer efficiency was higher.