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本文提出了修正的时域有限差分法（ＦＤＴＤ）来分析计算色散媒质中瞬变场问题，并采用普郎尼近似法使时域卷积可转化为违推计算，是充分利用现代计算机技术解决时域和宽带电磁场问题的一种有效手段。同时运用此方法对色散媒质中及色散媒质覆盖的导体目标瞬时域散射场进行了计算和分析，直观可靠地反映了其特性，并与传统的（非色散）ＦＤＴＤ方法计算的结果进行了比较，差别是显而易见的，为此必须重视色散媒质对瞬变场分析的影响。
In this paper, a modified finite-difference time-domain method (FDTD) is proposed to analyze and calculate the transient field problem in dispersion media. Using the Pulani approximation method, the time-domain convolution can be transformed into a non-push calculation, which is fully utilized by modern computer technology Time-domain and broadband electromagnetic field is an effective means. At the same time, this method is used to calculate and analyze the instantaneous scattering field of conductor covered by dispersive medium and dispersive medium, and its characteristics are directly and reliably reflected. Compared with the traditional FDTD method, The difference is obvious, for which reason the influence of dispersion media on transient field analysis must be emphasized.