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This study is to contribute towards preventing LBP(Low Back Pain) and MSDS (Musculoskeletal Disorders) through suggesting management plan after evaluation on each part of body of manufacturing assemblers by using OWAS(Ovako Working posture Analysis System) that is ergonomic evaluation tool of work-posture.The results of analysis are; in case of upper limb, work-posture of holding up one arm takes 55%; in case of the back, stretching out takes 40%; and in case of lower limb, squatting posture takes 40%. The AC(Action Category) ratio of analyzed work-posture shows that 25% is very dangerous job, and 50% needs improvement in general. These ergonomic evaluation of work-posture can be used as important data to grasp the necessity of changing facility and layout in work place.