Considering online channel modes of reselling and agency selling,this paper proposes a game model to explore the matching relationship between the online channel structure and the manufacturer's distribution strategy in a dual-channel supply chain. The results show that the manufacturer would prefer selling high-end(low-end) product through online(offline) channel when consumers are less(more) sensitive to product differentiation; when consumers are moderately sensitive to product differentiation, the manufacturer would prefer selling high-end(low-end) product through online(offline) channel in the online reselling(agency selling) mode. Also, increasing the degree of online and offline product differentiation is beneficial to enhance the manufacturer's profit. The conclusions can provide theoretical guidance for the integration of online and offline channels.