When metal frame structure buildings suffer lightning stroke

the transmission of lightning current and the distribution of the electromagnetic characteristic always affected by the building materials

structures and inte-grated grounding resistance and other factors

so the lightning effect is often more difficult to make accurate quali-tative and quantitative analysis. Based on finite difference time domain method simulation

the instantaneous cur-rent transmission characteristics and internal space electromagnetic change features of metal frame structure build-ing

which can be dynamic display and the qualitative analysis on the metal frame

then using the probe and select reference section can quantitative analysis of electromagnetic field at different position at the same time

at last

some valuable conclusions and protection measures were proposed from the study of characteristics of fields.