Shanghai Expo 2010 is an international event which will demonstrate the scientific, economic and cultural advance of the exhibiting countries. The local government launches a project named on-line Shanghai Expo in order to make the event accessible to people through Internet. Virtual reality technologies, especial intelligent virtual environment (IVE), are exploited to support the Expo. IVE, based on semantic, is the integration of Virtual Environment and Artificial Intelligence. It can improve the interaction between avatar and the virtual world by giving the objects in the environment semantic information. In this paper we employ intelligent virtual environment to build a virtual environment of realistic behavior and intelligent navigation.