The probable risk of electromagnetic fields produced inside high voltage substation is still considered as a competitive topic for utility designers and biomedical field researchers. Hence, the electromagnetic field levels and their induction inside human body should be pre-evaluated as early as the design stage of the substation. This paper deals with the computation of the electromagnetic fields induction in human body inside a typical high voltage 500/220 kV air-insulated substation (AIS). The typical high voltage substation is simulated by developing multi-scripts of m-file Matlab software package to calculate individually both of electric and magnetic fields. Moreover, analytical human body is simulated and allocated within the highly exposure zones of electromagnetic fields. The electromagnetic fields induction inside the human body during live working conditions at different accessible positions is evaluated based on the finite-difference timedomain (FDTD) method for solving Maxwell’s equations and the absorbed power density (w/m2) is calculated using the power density vector (poynting vector).