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The Boost Converter is basic topology for stepup DC-DC Converter. The Boost Converter usesswitching device such as MOSFET and IGBT. Every switching devices have body resistancesbecause of their own characteristic and structure. the one of body residences is RD which causes alot of loss in the power conversion system. Additionally, too high RD causes abnormal operation. In this paper, we analysed the characteristic ofboost converter with each various RD situation. Finally, we tested the performance and problem ofthe analyzed system with PSpice. In order to solvethis problem we designed multiphase converter. Itwill be helpful to design higher performance boostconverter with stable operation.