Considering that knowledge of intangible cultural heritage includes accumulated concealed experiences in the long term, it is difficult for the existing forms of multimedia to completely represent the complex relationship among different knowledge. A framework is designed to express and share knowledge based on ontology. The knowledge of "Dragon Boat Festival" illustrates how to determine the research scope, and then construct knowledge ontology model based on CIDOC CRM according to the entities and properties. Finally, a prototype is implemented through the key technology of Web 2.0.