2-5 years. Librarians and assistant librarians should be separated by 2-5 years. In the first year of working in the library, the librarian, from the second year to the fifth year without evaluation, and the assistant librarian, automatically transferred to the sixth year without evaluation. Those who have published more than two academic papers about libraries and passed the national professional title English and computer exams can participate in the librarian title, which is an intermediate title.