e interaction between human head model and electromagnetic �eld sources is studied. e head models are composed of one and six layers. e six layers are skin, fat, bone, dura (the outer membrane of brain and spinal cord), CSF (colony stimulating factor), and brain. An antenna as a source of exposure is simulated too. e E-�eld strength distribution in both one-and six-layer human models is shown to estimate the intensity of E-�eld penetration in human head. Like standard models, the antenna is situated near the head model at a distance of 5 mm. e local and average SARs (speci�c absorption rates) are simulated at �00 MHz in both human head models. e results are then compared between the two models. e HFSS soware is used for all the simulations. e paper wants to show that the initial model (one layer) is not a good model, because the real human head tissue is not equivalently modeled. It seems that the values of one-layer model are not reliable, so the paper considers the better and more similar human head model and compares these two models.