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根据各向异性介质的扰动理论来计算走时。首先简述各向异性介质的扰动理论，并推导非退化和退化情况的相速度扰动公式，而走时扰动可表示为沿未扰动介质中射线路径的积分；当未扰动介质选为均匀各向同性介质时，计算就较为简化。所给的数值例子证明了相速度扰动公式和走时计算公式的正确性。
Travel time is calculated according to the perturbation theory of anisotropic media. Firstly, the perturbation theory of anisotropic media is briefly introduced and the phase velocity perturbation equation of non-degenerate and degenerate case is deduced. The perturbation can be expressed as the integral along the ray path in undisturbed media. When the undisturbed media is selected as homogeneous isotropic When the media, the calculation is more simplified. The given numerical examples demonstrate the correctness of the phase velocity perturbation formula and travel time formula.