This understanding was initiated by Liu Xiang and Liu Xin at the end of the Western Han Dynasty. Liu and his son sorted out the group of books, collected books extensively, collated different books of the same book, wrote relatively complete books, wrote narratives at the same time, that is, wrote abstracts, and then catalogued all the books to reveal their academic origins and provide reference for research. The work done by Liu and his son is the most basic research work of classical philology. Later generations explain the learning created by Liu and his son in a broad sense, that is, all the contents, versions and proofreading are stuffed into the big pocket of "proofreading", which has almost become another name for classical philology.
China's classical philology can be divided into broad sense and narrow sense, while the narrow sense of ancient philology is catalogue, edition and collation. Philology in a broad sense includes discrimination, compilation, textual research, primary school and so on. The teaching of classical philology in China began in the late 1950s and was initiated by Wei, Zhang Shunhui and other old philologists from Peking University. China's classical philology, as the foundation of Chinese studies, even has a direct family relationship with Chinese studies. With the rise of Chinese studies, classical philology has also received people's attention.