Along with the development of construction technology, impervious system for medium-low RCC dams has trans-ferred from two-graded concrete to three-graded concrete, and even no impervious layer. However, the width of impervious layer is not determined clearly. Based on the study of permeability coefficient of RCC dams, we carry out seepage calculation and seepage stability analysis for 100m-level RCC dam of full-face three-graded aggregate. The results show that the application of C20 three-graded aggregate RCC at upstream impervious area of 100m-level RCC dam could satisfy the requirements of structure seepage stability. Further, the recommended width of impervious layer is provided.%随着施工工艺的发展，中低碾压混凝土坝防渗体系逐渐由传统二级配混凝土防渗过渡到三级配混凝土防渗，或者直接不设防渗层，但相应防渗层厚度尚未明确。在探讨碾压混凝土渗透系数取值问题的基础上，对百米级全断面三级配碾压混凝土坝开展了渗流计算及渗透稳定分析。结果表明，百米级高重力坝上游防渗区采用C20三级配碾压混凝土，能满足结构渗透稳定要求。在此基础上给出了防渗厚度建议值供工程设计人次参考。
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