Necessity of carrying out subject service in college and university libraries,its-related problems and their solutions

It is the needs of the times,subject construction in colleges and universities,development of libraries themselves to carry out subject service in college and university libraries.Subject librarians are the prerequisite for carrying subject service.How to strengthen and promote subject service in college and university libraries by innovating in the service provided by subject librarians was discussed according to the problems in subject service of college and university libraries.