In recent years, Taiwan's auto parts industry is facing globalization and worldwide competition. The company is in increasingly difficult operating environment, and the traditional mass production has gradually become obsolete. Nevertheless, the Toyota production system (TPS) can effectively improve quality, enhance operational efficiency and enable flexible production lines. This study deeply explored through case studies, and conducted a TPS series of events including aspects in logistics, quality, production and safety. By cutting off the waste and unnecessary process, improvement was obtained. The lead time was reduced from 75.5 hr to 23.5 hr. It was confirmed that the implementation of the Toyota Production System can effectively identify the real cause, set goals to improve step by step, and review the problems of each stage. Therefore TPS can effectively improve and enhance corporate profitability and the competitiveness of enterprises.