The development and application of internet successfully changed human¡¦s life. For example, when going shopping ,you don¡¦t go outside and compare the different prices in different stores. With the various applications of internet, all kinds of information form internet is overloading and the internet users are hard to explore the websites which is useful and meaningful. Therefore, the portal website is created to solve the problem. Jerry Yang established the first portal website named Yahoo! which is based on a catalogic search engine, and the Yahoo! Business model became the basic framework of portal websites. In Taiwan, Yam is the first Chinese portal website and then Pchome and Yahoo! kimo entered the market and shared the market value. Because of the internet bubble in 2000, The rising situation of market competition has changed rapidly, and only the survivors can face the crisis and decide to change their business models to find the definite position. The research is based on the framework of RBV to discuss the different business model of the three representative companies¡ÐYam, Pchome Online and Yahoo! kimo. According to the RBV, we can understand the resources of the three companies and analysis how to use the different resources to form their business model. The result of the research shows that the relationship between resources and business model, and describe the different shapes of the three companies. I hope that the case study of the research can be an good example to other potential portal website to create their competitive advantage