After the Three Gorges Reservoir storages water to 175 m, part of the arch ring of Wanzhou Yangtze River road bridge is submerged. Once the ship is out of control or goes off the channel and then collides with the arch ring, the arch bridge is easily to collapse and thus leads to accidents. Based on the current situation of the bridge, we propose arch-shape waterborne up & down anti-collision facility which will raise and fall automatically with variation of water stage. The impact of the anti-collision device on bed evolution, navigation clearance dimensiona, navigation current condition, as well as vessels’ navigation condition is analyzed by physical model test and numerical simulation.