Under the condition of Library 3.0, the service elements and structure of the library will undergo a turning point. Loft Bell and others think that Library 3.0 refers to the library service in the virtual world. The essence of the concept of Library 3.0 is to emphasize the extensive participation of librarians, not only to provide services in the physical space and cyberspace of the library, but also to actively enter the virtual space to open up new service areas. In the virtual world, people collect librarians. Not a book. The central theme of Library 3.0 is "Guidance". With the development of information technology, the manual and low-level work in the library is entrusted to computers, and the work undertaken by librarians will be more complicated and challenging, which will also bring about the promotion of the professional and social status of the library. Using Web3.0 technology to create a library and build a virtual community, and to build and provide new information exchange services has become one of the typical applications of Library 3.0 [1o2Necessity and possibility of building a virtual community 2]