Abstract
Recently, the semiconductor process has greatly advanced and the function of chipset is also getting complexity to bring on the Wafer testing process is getting more and more important。However, its investment of equipment is also getting more expensive cause lots of IDM company (integration components factory) and wafer foundries do not intend to keep investing on IC testing portion. They plan to outsourcing the business to wafer testing company .The business of wafer testing company has significant growth.Because of the gross profit and profitability may not be more higher anymore than before, the case company was thinking about has started to developed homemade test equipment in many years ago and has been released it for mass production, they are trying to control the cost of test equipment by themselves instead of purchasing all the test equipment with vendor .The purpose of the study is going to compare the business performance of each business unit with the proportion of homemade test equipment. The research plan to get actual business performance of 9 business group from 2010 to 2011 to compare the performance of production with homemade and non-homemade test equipment by Data Envelopment Analysis (DEA) .The result of the study shows the performance of business unit with homemade test equipment is more better than the business unit without homemade test equipment .