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When MIT wireless power transmission system acquired the maximum transmission efficiency, magnetic and electric field distributions of resonant coil were simulated by full wave method of moments and magnetic quasi static algorithm. Human brain absorption of electromagnetic radiation of the system was analyzed quantitatively by using HFSS finite element simulation software. The simulation results show that if the power of 400 W is transferred, the maximum magnetic field strength and the electric one of resonant coils are 9.376 3×10-3 A/m and 1.52×102 V/m respectively. The magnetic field strength meets standards of International Commission on Non-Ionizing Radiation Protection but the electric one beyond the standard value. The maximum of local SAR is 7.038 9×10-6 W/kg at 100 mm away from the transmitter coil, which is less than the standard value of International Commission on Non-Ionizing Radiation Protection.