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In this paper, we introduce the On-Line Electric Vehicle (OLEV) system and its non-contact power transfer mechanism. We propose the design methodology to maximize the wireless power transfer capability and power transfer efficiency and to minimize the electromagnetic field (EMF) from the wireless power transfer system in OLEV. By using the series resonant power transfer topology and vertical magnetic flux type of wireless power transfer system for transformer structure, the power transfer capability of 60 kW and efficiency of 80% have been accomplished. Also, by applying passive and active shields, the EMF has been significantly reduced to satisfy the regulation of 62.5 mG.