近年来，三维叠前深度偏移地震资料处理技术得到了一定的发展，但是由于三维叠前深度偏移处理计算量大，要求有精确的深度—层速度模型，一直未走向工业化生产阶段。本文是在具备大型计算机的基础上，着重对如何求取精确的深度—层速度模型进行了探讨，提出了三维层速度相干反演和三维深度—层速度模型的优化处理方法。 In recent years, the 3D prestack depth migration seismic data processing technology has been developed to a certain extent. However, due to the computational complexity of the 3D prestack depth migration, an accurate depth-velocity model is required and has not been going to the industrialized production stage. On the basis of having a large computer, this paper focuses on how to get accurate depth-layer velocity model, and proposes three-dimensional layer coherence inversion and three-dimensional depth-layer velocity model optimization method.