the internet has entered the era of Web 2.0. Library 2.0, which is mainly based on the interaction between users through some applications such as wikis, blogs, etc, is a new type of library service in Web 2.0 environment. In this paper, we discussed the Web 2.0 features and some of which can be used in university library web sites. Thus, we explore the trends of Web 2.0-based internet application in the university libraries all through the universe.