汽车与公路指示牌立柱的碰撞是极其危险的交通事故。本文分析了汽车与公路指示牌立柱碰撞事故中车辆受损的原因,提出了碰撞后快速脱离的新型指示牌立柱,并利用有限元方法对汽车碰撞指示牌立柱进行仿真模拟试验,根据研究结果证明结构合理正确,能够在碰撞中减少车辆和乘员的的损伤程度。 The collision of the car and the road sign post is an extremely dangerous traffic accident. This paper analyzes the reason of vehicle damage in the collision of automobile and highway signpost column, proposes a new type of signpost column which can be quickly separated after collision, and uses the finite element method to simulate the collision of the signpost of the automobile. According to the research results, Reasonable structure, can reduce the collision of vehicles and occupant’s injury level.