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This paper describes an analytical method to find optimal side structure of convertible vehicle for occupant protection using full vehicle finite element model compared with typical notch-back style vehicle. The strategy of occupant protection for convertible vehicle is quite different from that of notch-back sedan in the view point of vehicle structure due to the limitations in building concept of side structures. In this study, the strategy leading to reliable results in the convertible type vehicle will be discussed. This analysis work shows a good preliminary result for predicting vehicle side structure behavior and occupant injury in early stage of car developing program.