Abstract: With the progress of information technology, online retailing is developing rapidly. Because e-retailers have a huge online shopping consumer base and are good at online sales, cooperation with e-retailers has become the best choice for suppliers to add online retail channels. For this reason, e-retailers (such as JD.com and Amazon) have greater voice and influence in the supply chain and occupy a dominant position, which is the result of the transfer of power from suppliers to e-retailers. These dominant e-retailers provide suppliers with reselling mode or agency selling mode to cooperate. In the reselling mode, the supplier wholesales products to the e-retailer and then the e-retailer sells products to consumers; In the agency selling mode, the supplier directly sells products to consumers by paying a commission fee to the e-retailer. At the same time, relying on advanced information technology and big data, dominant e-retailers have more abundant and accurate market demand information than suppliers and traditional retailers. Therefore, it is worthwhile to study the information sharing strategy and operation strategy in the presence of a dominant e-retailer under competition.

Key words: supply chain management; the dominant e-retailer; information sharing; online selling mode; game theroy