本文介绍了一种在不规则网格中用费马最小时间原理进行射线追踪的新方法。除通常的透射和反射波外,还可以模拟折射、散射和转换波。该算法既快又稳定,并且遵守震源和检波器之间互换原理,优于其它采用中靶法的过程。特别适合于做旅行时反演。不规则网格的使用使得地质体的离散化适应于有效的采集几何排列和射线分布,从而得到更加稳定、可靠的层析图像。 This article presents a new method of ray tracing using the Fermat minimum time principle in an irregular grid. In addition to the usual transmitted and reflected waves, it is also possible to simulate refractions, scattering and converted waves. The algorithm is fast and stable, and complies with the principle of interchange between source and detector, which is better than other methods using mid-target method. Particularly suitable for travel when the inversion. The use of irregular grids makes the discretization of geological body adapt to the effective collection of geometric arrangements and ray distribution, resulting in more stable and reliable tomographic images.