Aiming at the status that the relevant theoretical research of aerated jet flushing to solve the problem of local sediment deposition is not deep enough, the dynamic characteristics and sand flushing effect of aerated jet were studied by flume experiment. In the gas water clear water test, four stages of plume development are proposed. Through the signal-to-noise ratio analysis of orthogonal test, it is found that the air pressure is the main factor affecting the undercut length of the plume, and the local turbulence intensity increases with the increase of air jet pressure, and decays rapidly along the transverse direction. In the pneumatic sand flushing muddy water test, three development stages of sand flushing pit are proposed. Through the signal-to-noise ratio analysis of orthogonal test, the main effect affecting the sand flushing effect is determined. The regression equation of sand flushing effect is established by variance analysis, and the comparison between predicted and measured values shows good prediction results of the regression equation.