提出一种高效有限差分计算和解释分析地震波场的新方法 ,其基本思想是波场运算只计算移动网格所包含的波前部分 ,解决了全地震波场建模曾存在的两个难点。首先 ,计算量明显减少 ,质量损失较小 ;其次 ,将复杂波场分解为相位进行分析。本方法只要适当修改现有时空域有限差分程序编码就可以实现。网格运动必须在建模之前给出 ,它可以比较精确地从低频有限差分建模或射线追踪中得到。二维试验证明 :在适度牺牲精确度的基础上 ,本方法建模可以减少大量内存需求和计算时间 ,而且可直接扩展到三维波场的计算和分析。 A new method of efficient finite difference calculation and interpretation of seismic wavefield is proposed. The basic idea is that the wavefield calculation only calculates the wavefront included in the moving grid and solves the two difficulties that existed in the modeling of the whole seismic wavefield. First of all, the computational cost is obviously reduced and the mass loss is less. Secondly, the complex wavefield is decomposed into phases for analysis. As long as the method is properly modified, the existing finite-difference program code in the space-time domain can be realized. Mesh motion must be given prior to modeling, which can be obtained more accurately from low frequency finite difference modeling or ray tracing. The two-dimensional experiment proves that on the basis of proper sacrificial accuracy, this method can reduce a large amount of memory requirements and computation time, and can be directly extended to the calculation and analysis of three-dimensional wavefield.