To reveal the distribution characteristics and intrinsic law of the flow field near the bridge pier in water under the action of ice cover flow, the spatial distribution and transient change characteristics of the flow field around the combined bridge pier under the conditions of clear water and ice cover scouring were investigated by applying indoor high-precision three-dimensional measurement techniques. The test results show that the distribution of longitudinal flow velocity along the vertical line at the section away from the bridge pier was parabolic under the ice cover flow condition, and the flow velocity in the middle and lower part was larger than that in the upper part, indicating that the ice cover roughness will change the vertical distribution of flow velocity and reduce the original thalweg position of the water flow section. The existence of ice-cover will weaken the frequency of the first and third quadrant burst events, while the second and fourth quadrant burst events will be strengthened. The vertical distribution of sudden events in all four quadrants shows a wandering pattern and the turbulence intensity of the water body was strengthened after the ice layer was covered, which is the key factor to promote the saltation of sediment particles.