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本文提出了基于Ｆｅｒｍ ａｔ原理的折射波正演算法，它以模型的离散划分和射线路径搜索为基础，适用于任意地形和起伏折射界面的速度可横向变化的模型。本算法快速且有效，对作沙漠和山地折射静校的研究有重要的意义。
In this paper, a forward algorithm based on Ferm at principle is proposed, which is based on the discrete model of the model and the search of the ray path. It can be applied to the model of lateral velocity change of arbitrary terrain and undulating refraction interface. The algorithm is fast and effective and is of great significance for the study of refraction static in the desert and mountains.