Abstract The purpose of the thesis is to explore two main subjects. First of all by interviewing managers and researchers who are highly involved in industrial e-Marketplaces to understand the developing stage of e-Marketplace in Taiwan domestic Steel and Automobile industry. Then, this thesis will compare the interviewing results with related literatures and researching papers in order to analyze and explain the differences and reasons between them. Second, this thesis also tries to predict the future expanding trends of the domestic Steel and Automobile industrial e-Marketplaces and discusses the impacts on representative companies¡¦ strategies by e-Marketplaces and how the representative companies reach their strategic goals through using e-Marketplaces. The main conclusions of this thesis include the nine lists below. 1. The e-Marketplace can¡¦t replace all established trading process, trading habits and supply relations in the short run. 2. The e-Marketplace can let buyers touch more sellers, increase information transparency and get the commodities with lower price by grouping auctions. 3. Buyers will transfer their transactions to on-line e-Marketplace step by step. 4. E-Marketplace can let sellers touch more customers, decrease inventory cost and grasp the market reactions and news. 5. E-Marketplace is sellers¡¦ new channel, but most of sellers still sell their products through established websites and channels. 6. The functions of e-Marketplaces always emphasize on competitive bidding and auctioning instead of buyer-supplier relations. 7. When an industry fragmentation is lower, that the industrial e-Marketplace led by leading company will be finer; when an industry fragmentation is higher, that the industrial e-Marketplace governed by justice third party will be better. 8. The main revenue of the e-Marketplace comes from transaction fees, subscription fees, added service fees and license fees. 9. The key success factors of the e-Marketplace operating are to gather many buyers and sellers, the most comfortable business services, deeply domain knowledge, good trading relations and good uses of customer data.