The development of information technology (IT) shortens the distance between people, blurs the boundaries among countries. People confront unprecedented shock in both living and working styles. Facing the era of speed, the firms have to recognize what their surviving competence is. Generally the adoption of IT indicates the efficiency and effectiveness of a firm. Therefore, the first centerpiece in this study is to examine the influence of adoption of IT on the manufacturing performance of thefirms. With its high quality and excellent process capability in manufacturing industry, Taiwan has currently become the "global manufacturing center". Nowadays Taiwan's firms will contract the orders of production and sales from global division of labor rather than simple manufacturing orders. The challenge that Taiwan's firms will confront in the future will be supply chain management (SCM), which is also a key issue for a firm to enhance its competence. Therefore, the second centerpiece in this study is to examine the influence of supply chain management on the manufacturing performance of the firms. Supply chain management has become a good tool of the firms in their business management. Therefore, the third centerpiece in this study is to examine the relationship between supply chain management and the development of IT, and their influence on the manufacturing performance of the firms. 79 semiconductor downstream firms were used as target of sampling for data collection, while effective recalling rate is 37%. The result of this study indicates: 1. The application extent of IT with the capability of SCM reaches significant level. 2. The capability of SCM with the manufacturing performance reaches significant level. 3. The application extent of IT with the manufacturing performance does not reach significant level.