The protective net used to prevent throwing on the bridge is called the bridge anti-throwing net, and because it is often used on the viaduct, it is also called the viaduct anti-throwing net. Its main role is to install on municipal viaducts, highway overpasses, railway overpasses, street overpasses, etc., to prevent throwing injuries, such a way can be a good way to ensure that pedestrians passing under the bridge, vehicles are not injured, in such a case, the application of bridge anti-throwing nets is more and more.