The purpose of this study was to develop method of evaluating a motion system using motion on standing posture and exercise load. In this paper, we report participants' motion on standing posture, participants' exercise load during standing on the motion system and compared with those on a marine craft. The measurement system consisted of three orientation sensors and a calorimeter. Orientation sensors capable of measuring linear and angular accelerations were placed on the head and waist of each participant, and on the floor of a small marine craft. Energy expenditure was measured using the calorimeter. In the small marine craft, participants were either sitting or standing. In the laboratory, participants were sitting, or standing on the motion system. Motion on standing posture was analyzed by calculating the root mean square (RMS). Exercise load was calculated by dividing the mean energy expenditure in each condition by that in the sitting condition. Passengers' motion on standing posture on the craft was mainly rotational motion. The exercise load during performing motion system was similar to that during standing on the craft. We thus suggested that motion on standing posture and exercise load are proved effective in evaluating a motion system.