Abstract: The flow pattern in the intake tank of pumping stations directly affects the working efficiency of pumps, and even the safe and stable operation of the whole pumping station.In this paper, based on CFX software, the Realizable k-ε turbulence model was used to study the dynamic changes of surface vortex characteristics and velocity uniformity in the intake tank under different water level and flow conditions.The results showed that when the water level was 600 mm, the distribution of surface vortex on both sides was asymmetric under small flow conditions.With the increasing of flow rate, the mutual influence of surface vortex on both sides decreased.When the water level was 800 mm, the surface vortex distribution on both sides was symmetrical under different flow conditions.When the water level was 1000 mm, the distribution of surface vortex on both sides was symmetrical under small flow conditions.As the flow rate increased, the mutual influence of surface vortex on both sides increased.With the decreasing of the water level at the characteristic sections, the total circulation of the vortex in the characteristic sections of the intake tank increased.The vortex total circulation in the section was inversely proportional to the water level and proportional to the flow.The velocity distribution uniformity of the pump intake section first increased and then decreased with the increase of flow rate, while it increased with the water level.