In order to increase the market share of steel finished products in the global market, Taiwanese government cancelled all import and export duties on steel finished products, and this made Taiwan steel industry much more competitive. Taiwan sets Mainland China, the largest steel finished product consumption nation, as the first target market, for Taiwan has the relatively superior location and the close and similar history and language. This dissertation is going to analyze and introduce the current situation and development strategy of Taiwan and Mainland China market through SWOT as well as the possibility of Taiwan steel industry development in Mainland China and the entry ways, such as, merge and acquisition.