Web intelligence is a new research direction for researchers, which is an integr ation of artificial intelligence and information technology on the new platform of the Web and Internet, an enhancement or an extension of them. Many fruits hav e been obtained in recent years, and many problems remain unsolved. The notion a nd research contents as well as the functions and technologic framework of Web i ntelligence are firstly discussed. Then some recent research developments that a re related to the key aspects of Web intelligence, including semantic Web and on tology, Web agent, and Web mining, are deeply surveyed, and at the same time som e further research stresses and trends are presented. Finally, the concept of wi sdom Web that is viewed as the goal and challenge of Web intelligence is discuss ed.