For the current situation and problem of mountainous highway drainage system,combined with the characteristics of highway washout by flood,the paper proposed the relative countermeasure.

• 针对山区公路排水系统的现状及存在的问题,结合近几年来山区公路水毁的特点,提出通过完善排水系统和加强排水系统的养护,来增强公路的抗洪能力,减少公路水毁损失。