In order to study the influence of internal pressure pulsation and flow noise of axial flow pump under stall condition,the unsteady flow of axial flow pump under different flow condition was obtained by calculating the unsteady numerical value of axial flow pump.With the help of the vorticity transport equation,the core strength and morphology of the vortex in the impeller channel under different flow condition were analyzed.At the same time,the correlation analysis between pressure pulsation and flow noise shows that pressure pulsation and sound pressure show a similar distribution trend,and the maximum value is located at the midpoint of the impeller inlet flow channel.Through fitting,it is shown that pressure pulsation and sound pressure has a good third-order goodness-of-fit,and the two are positively correlated.