In recent years, competition among companies became hard under the circumstance of the globalization. Cheap materials are imported from abroad or assembled in abroad using cheap labor. Lead time of manufacturing in Japan tends to be prolonged, which causes the increase of stocks. To cope with this, correct demand forecasting becomes inevitable and reformation of production system is required. In this paper, critical success factors in supply chain management are arranged and concrete grappling with these issues in sanitary materials manufacturer is described. Such trials should be expanded in various fields hereafter.