In response to the complex geological conditions and harsh environment along a certain expressway,as well as the presence of a large number of soft soil layers in the construction section,a study on the design scheme of soft soil roadbed was carried out.Based on the characteristics of soft soil roadbed and construction environment,propose a design plan and reinforcement plan for highway soft soil roadbed.Finally,settlement monitoring was conducted on the roadbed.The research results showed that the reinforcement treatment of soft soil roadbed can be achieved through the construction process of gravel piles,and the reinforcement effect is clearly feasible and practical.Moreover,the settlement of soft soil roadbed shows a gradually decreasing trend.