Subgrade is the main load-bearing structures of road engineering,required to have high strength and good stability.However,the infiltrated surface water and groundwater will erode the Sub-grade,deteriorating its strength and stability,even leading to security risks.In this paper,the prevention and drainage composite waterproof design and construction of a highway engineering is researched,the practice proved that the prevention and drainage composition has significant advantages in road subgrade waterproof,has great application value and promotional value.%路基是道路工程的主要承载结构，需要满足高强度和良好的稳定性要求。然而地下水和渗入的路面积水会侵蚀路基，使路基强度和稳定性变差，导致安全隐患。结合某高速公路工程建设项目对路基防排结合式防水设计和施工技术进行研究，实践证明防排结合式防水方案在道路路基防护中体现了显著的优越性，具有重大的应用价值和推广价值。
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