Abstract: Titles are important topics of research on the ancient book system, and book title is the highest
level. But book titles’ research is the weakness of current academic research on the ancient book system.
Mr. Yu JiaXi had proposed, the early ancient books wrote their own titles “begun with Lü Lan, and became
popular in the Han Wudi”. Many handed down and unearthed documents directly or indirectly proves that
no later than the late Warring States period book titles began to appear, until Emperor Wu had become
more prevalent, by the end of the Western Han dynasty the book title inscribed has been very popular, and
someone began to focus on the title’s meaning.

Key words: Ancient books, Book titles, Title format, Unearthed documents