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With the surge of environmental problems, the number of small vehicles with lower energy consumption is increasing. For such a vehicle, difficulty of achieving crashworthiness exists since it has smaller deformation space in a frontal impact accident. Smaller deformation space needs high vehicle deceleration for absorbing kinetic energy of the vehicle.The high vehicle deceleration in the event of a frontal collision may produce high occupant deceleration, resulting high chances of an occupant injury value. In this study, over 138 types of vehicle decelerations expressed by three variables in a frontal collision were examined in order to reduce occupant decelerations. Solving differential equations, following results were obtained (1) The minimum value of the maximum occupant deceleration exists.