Based on the monitored images and field experiment data of 2019-2020, the behavior characteristics of the ice and water flow dynamics of the Shisifenzi Bend in the Yellow River was analyzed. Results show that the main reason for the ice jam in the bend is the morphology of the river channel, which is wide at the upstream and narrow at the downstream. During the open flow to freezeup period, the project at the bend apex promoted the formation of upstream backflow area by supporting the water flow. Affected by the centrifugal force of the bend, the river ice accumulated on the concave bank of the river and formed an ice bridge, which reduced the ice area of the river, then the river gradually froze up. In the downstream of the bend apex, the flow velocity was larger and lack of adequate ice, so the open flow area formed and the mainstream developed towards the middle of the river. The ice jam accumulated in the main channel of the concave bank of the bend apex, so the flow was squeezed to the non ice jam area of the convex bank, and the mainstream of the river channel changed its path. The hydrodynamic characteristics of the river ice basically did not change during the stable freezeup period. During the breakup period, the non ice jam area on the convex bank had a high flow velocity and gave priority to thawing, then the ice transported along the mainstream line, the ice cover in the backflow area melted the last, and the mainstream of the river gradually returned to the free flowing status, showing a regression trend.