In the wireless power transmission system based on magnetic resonance method, simulation analysis of the magnetic field distribution was conducted, and was compared with experimental results. To suppress near-by magnetic field than the power transmission direction, the shielding case was arranged on the back of each coupler, and the effect was checked. The evaluated system using 13.56MHz ISM band can supply 1 kW to the 72V lead battery of EV in the range of 10~30cm of z axis.