The subjects librarians have great importance in the subjects construction of college and universities and their posts are crucial while the library is carrying on its subject service functions. To carry out the service concept of Lib 2.0 is to follow its concept of penetration, intercommunication and individuation, to penetrate the teaching, research and clients with the librarians' service, to guide the clients to participate in the data collection and knowledge creation, to improve service according to the clients' experience, to intercommunicate with the clients and to serve for the clients individually with a virtual information platform.