Abstract: Introduced the main elements of snowmeh agents and the snow melting mechnism，and analyzed the main reasons for the damage to the layers of roads and bridges when using the snowmeh agents excessively.The layers of roads and bridges could be corroded and destroyed if amounts of salinity infiltrate permeate into the road and bridge，and the plants here could be shrivel and perished．Then the preventing methods are suggested.

Key words: the layers of roads and bridges, snowmeh agent, destroy, prevention

摘要： 介绍了除雪剂的主要成分和融雪机理．分析了大量使用除雪剂对路桥表面造成危害的主要原因．大量的盐份 渗入路桥表面，会对路桥表面造成极大的腐蚀破坏，导致植物枯萎死亡，同时提出了预防措施．

关键词: 公路, 除雪剂, 危害, 防治