Today, knowledge resources have become one of enterprise¡¦s important assets and are the key factor for an enterprise to gain competitive advantage. Bill Gates in his book ¡uDigital Nervous System¡v pointed out that enterprise's competition is the competitions of knowledge and network in the future. Therefore, much attention has been paid to how knowledge is managed in supporting employee¡¦s knowledge activities. This study presents a methodology for classifying and modeling the enterprise knowledge for knowledge sharing based on Microsoft enterprise information portal solution. This methodology enables enterprise policymakers and system implementers to develop high-level strategies that fit user¡¦s demands in knowledge sharing and facilitate the implementation process. To illustrate the methodology, we use a real case from chemical industry to test the usability (including the concepts, application, and advantages) of the proposed methodology. The results indicate that with this approach, the implementation of enterprise information portal can be more easily and systematically.