The researches try to find suitable competitive advantage business modulus to run mainland China market for Taiwanese coil steel enterprises. We suggest them competitive strategy for mainland China coil steel market. Taiwanese coil steel enterprises usually enlarge product capacity strategy decreasing product unit cost to increase oversea market share. They enlarge product capacity quickly. The majority coil steel users transfer their base of manufacture to mainland China such as steel pipe manufacture, computer supplement equipment , bicycle component, motorcycle component, house electrical supplement component, sport equipment, steel furniture. Taiwanese coil steel enterprises loss money as overcapacity. The situation is changeable because mainland China market increases demand recently. The international trade steel unit price reaches the highest record during decade. China is the most amount steel importing country in the world. The flourish China steel market benefits Taiwanese coil steel enterprises all. The competitive advantage should match suitable value creation modulus that makes competitive advantage enhance effect. We call on 110 Taiwanese coil steel correlated enterprises sales mangers. Regional consolidation, specialization and downstream migration, deconstruction and global networking are three kinds value creation modulus. We inquire their opinion to choice one value creation strategy from three value creation modulus. This value creation strategy matches competitive advantages which are low cost, differentiation, focus, entrepreneurship and integration. The statistics of questionnaires conclude Specialization and downstream migration to be the best value creation strategy.