Electronic commerce model has made an impact on the travel industry of Taiwan. There are multiple distribution channels in the Internet while new technology customers have already inclined to buy straight from the supplier's Web site, especially a price-sensitive customer who loves to shop around will remain the natural constituent of an on-line travel agency. In my view, Travel agents should know their resource and competitive advantages; adopting an optimal E-commerce strategy in order to acquire effective performance. Furthermore, considering the market uncertainty and transaction cost; travel agents may construct an optimal transaction model for consumers; related business industry and themselves.