Even though Just-In-Time Production System is introduced to industry in order to strengthen competition, applying this production system to field is hard and some problems are occurred. On this study, the algorithm which become smoothed production, one of the prerequisite condition for implementing Just-In-Time, are developed. On the other word. it is possible to become smoothed production based on keeping Lot Production System. The possibility of establishing more stable smoothed production scheduling are proved on this study by comparing with previous researches.