The assumption model of this research is to analyze structure analysis the which are based on Michael E. Porter(1980) five forces analysis，finding its industrial structure. Using the Key Success Factors definition of David Aaker(1984) researches IC manufacturing companies whose key success factors. To use Porter's competitive model，three competitive strategies :(一)Low Cost Strategy (二)Differentiation Strategy(三)Focus Strategy. With the help of questionnaires & expert interviews to weigh the sub-factors, its ultimate aim is to forecast the future trends as the basis of strategy planning for private enterprise & follow-up researchers.
