The lightning has been a great threat to the nuisance in the domain of aviation, the military affairs of the national defense,but a mass of researches only care about the protection of building and electronic equipments on the ground. Aiming at this situations lightning return strike physics model was set up in this paper,the distribution of lightning electromagnetic pulse (LEMP) above ground level was analyzed carefully. Finally, the computing expression of LEMP at anywhere of space was educed, which reflected the relationship among LEMP, speed of lightning return current,magnitude of lightning current,the point altitude and some other factor. By calculating the LEMP on the ground level,the feasibility of this method was validated.%雷电对航天航空、国防军事等领域的设备、设施有着极大的威胁,但是,国内外的大多数研究都局限于地面建筑物与电子设备的雷电防护.针对这种情况,推导出空间任意场点处的雷电电磁场计算表达式.该表达式反映了雷电电磁场和雷电流回击速度、雷电流大小以及场点高度等多个因素的关系.数值仿真计算了地面场点附近的雷电电磁场,与实际的雷电电磁场的变化规律相吻合,验证了模型的可行性,可作为进一步研究雷电与飞行器在空间的交互作用的理论基础.
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