ºK ­n This study is to discuss the core competence of IC seal industry, and to construct the model. The purpose of this study are presented as follows: 1. To define which competence is core competence of IC seal industry. 2. To structure the core competence build-up model. 3. To confirm the model is workable. 4. To develop and to manage the core competence. This conclusions of this study are presented as follows: 1. Core competence of IC seal industry includes research and design ability, product engineering technology development ability, cost control and strategy management ability, manpower development ability. 2. Core competence will build up from the process of executing the total quality management.