The quality control of products during manufacturing before World War II was independent of the manufacturing process to assure the unique and best quality of goods. Of which characteristics is to control the quality of products after finishing. Due to the total quality management has initiated recently, the feedback of consumer¡¦s preference, raw materials¡¦ supply, design of products, manufacturing, check-up, selling strategy and after-sales service arose from the manufacturers. The crucial competition in enterprise management has become the essential debate i.e., innovative and high-grade products are needed concurrently. Innovation is the threshold of the sustained yield of an enterprise, but to meet and give rise to the requirements of clients through the market survey. Additionally, we should incorporate a new management system with innovation ¡V reduce the capital, develop up-to-date techniques, to attain the target of sustained yield. By using the new methods of enterprise management system and proposing novel recipes that can achieve an admirable target in business management in the twentieth-one century. Because of the specific needs in high-precision and great capital investment in semi-conductor industry, any rejects may lead to earnings loss. Thereafter, the increase in accepts is the main target to pursue for semi-conductor industry. Enhancing the accept percentage is synonymous with profit-based market. Reducing the reject percentage will lead to increasing the profit of business. ¡§Quality Control is the main trend in twentieth-one century¡¨ said Mr. J.M.Juran ¡V an American expert of quality control ¡V in American Society of Quality Control (ASQC). For instances, the reject rate of electronics has been reduced from 0.001 to ppm (parts per million), even to ppb (parts per billion). In view of the previous 3 £mdefect, the reject rate is 2.7 ¡Ñ10 -3 under the state in statistical control, but it has been dropped to 2 ppb (2 ¡Ñ10 -9 ) in a new 6 £mdefect. In other words, the new level of reject rate has been reduced to 1.35 million times that of the previous standards. We call this standard likewise ¡§Ultra severe quality requirements¡¨. Face the severe challenge of quality control and the strong competition, a novel quality control is beneficial to the sustained yield of semiconductor industry. The purpose of this study tries to investigate the feasibility of the application of ultra severe quality requirements to a semiconductor company. And describing the methodology of 6£mthat focuses on process improvement and variation reduction.