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为解决南水北调中线工程黄河北-河北段渠道高地下水位渠段渠道边坡及衬砌的稳定性问题，计算衬砌下地下水的扬压力，采用有限元法复核渠道内坡排水措施，在稳定渗流工况与非稳定渗流工况下，采用不同排水管间距、粗沙垫层厚度和渗透系数、基础土层渗透系数组合，对衬砌板下水头敏感性进行分析，并根据计算分析结果对高地下水位渠段提出了衬砌排水垫层、排水管的调整措施，以优化排水设计，节省工程投资。“,”In order to solve the canal lining stability against floating problem in high groundwater level of the north Yellow River to North You River of the Middle Route of South-North Water Transfer Project and calculate the groundwater uplift pressure of the canal lining,it reviewed the drainage measures of inner canal slope by using FEM. It analyzed the head sensitivity according to different discharge density,coarse sand cushion layer thickness,filtration coefficient,and foundation soil filtration coefficient combining in stable and unstable infiltration flow conditions. According to the analysis results,it put forward the adjustment measures of drainage blanket and lining tube of different groundwater elevation high level canal for optimizing the design of water supply and drainage and saving the engineering investment.