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地震波旅行时计算是Kirchhoff积分法叠前深度偏移成像的核心内容，其精度决定着最终偏移成像的效率和效果;另外，在射线理论正演中，旅行时计算的精度也决定着其振幅计算的准确程度。因此，它受到众多学者的关注。针对目前最典型的几种地震波旅行时计算方法（如平面波的有限差分法、线性插值法等），本文从本质上比较了它们之间的差异与相同之处，指出了各自的特点及适用范围。文章重点讨论了球面波近似旅行时计算方法，并弥补了Schneider（1992）算法在实现方法上的不足。最后通过模型试算，验证了球面波近似算法及平面波近似算法在层析成像中的效果。
The seismic traveltime calculation is the core of the Kirchhoff integral method prestack depth migration imaging, the accuracy of which determines the efficiency and effect of the final migration imaging. In addition, the accuracy of the traveltime calculation also determines the amplitude The accuracy of the calculation. Therefore, it has attracted the attention of many scholars. In view of the most typical methods of travel time calculation of seismic waves (such as the finite difference method of plane wave, linear interpolation, etc.), this paper essentially compares the differences and similarities between them, and points out the respective characteristics and applicable scope . The paper focuses on the calculation of spherical wave approximation travel time and makes up for the lack of implementation of Schneider (1992) algorithm. Finally, through the model trial calculation, the effect of spherical wave approximation algorithm and plane wave approximation algorithm in tomography is verified.