This paper deals with the interaction of the electromagnetic pulse（EMP） with human body by the Frequency-Dependent Finite-Differenee Time-Domain method（（FD）

2

TD method）. According to the original experimental dielectric constants of human tissue in the frequency band 10MHz-3GHz

this paper proposes a simplified dispersive model of the human body which is composed of two types of tissues （Fet/bone/cartilage

muscle）. Both this model and the 12 types of tissues dispersive model are used to analyse Specific Absorption（SA） and Induced Current in human body for exposure to raised-cosine EMP and nuclear EMP for different incident directions. The feasibility of the simplified model is verified by comparing the results. The calculated results show that the maximum SA（15mJ/kg） is three orders lower than the limited values（28.8 J/kg） given by the ANSI/IEEE C95.1-1992 guideline for the human body exposed to the typical nuclear pulse（the maximum E-field is 6SkV/m

and the pulse duration is shorter than 85ns）.