To further investigate the effect of flow rate and rotation speed on the gas distribution in a multiphase pump,based on the timeaveraged N-S equation and Simple algorithm,the FLUENT software was employed to simulate the threedimensional flow in the pump at 30% inlet gas void fraction under different flow rate and rational speed conditions.The results show that the flow rate has a greater effect on the gas distribution at the hub on different sections of the first stage impeller;the gas void fractions at the inlet and outlet sections increase with the increase of the flow rate.The gas void fraction from hub to shroud on different sections of the first stage impeller is changed drastically when at the higher rotational speeds of 2 500 r/min and 2 950 r/min .The gas void fraction at hub of the first stage impeller is changed drastically at different flow rates and rotation speeds.The research results provide a reference for optimizing the performance and providing gasliquid transport capacity of pumps.