Taking the application of RAMAC geologic radar in Ereshan road tunnel geological advance forecast as an example, this paper intro-duced the work principle and method of geological radar, and combining with the detail geological description of excavation tunnel face, accurately prediction of the joints crushing zone and groundwater development area of excavation front surround rock, provided scientific, accurate information for the new Austrian tunneling method, avoid the blindness of tunnel construction, guaranteed the construction safety and engineering quality.%以RAMAC地质雷达在二峨山公路隧道中地质超前预报的应用为例，介绍了地质雷达的工作原理与方法，并结合开挖掌子面的详细地质描述，准确预测了开挖前方围岩的节理破碎带和地下水发育区，为新奥法隧道施工提供科学、准确的信息，避免了隧道施工的盲目性，保障了施工安全及工程质量。
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