Abstract: To avoid impact and flexible energy dissipation anti-collision design,the curved-shaped anti-collision floating box made of steel-polyurethane sandwich plate is introduced for the round end shaped pier in the river channel. The ship, floating box, and pier collision system simulation model is established by ABAQUS software. Impact on the floating box, the pier, system energy conversion, and the turn the bow degree are analyzed in different angles when the collision. The results show that the floating box has a good anti-collision effect, absorbs most ship kinetic energy, reduces the impact force of pier under the most unfavorable impact. The box removes the bow easily when colliding obliquely in the general case , reserves most of the ship kinetic energy in the flank crash, protects bridge pier effectively.