During the Western Han Dynasty, Yang Xiong's "Yi Xuan Messengers Explain Other Dialects", referred to as "Dialects", was the cornerstone of the study of Chinese dialects.
Xu Shen's Shuowen Jiezi in the Eastern Han Dynasty, referred to as Shuowen;
In the Eastern Han Dynasty, Liu Xi wrote Ming Shi, explored the motivation of naming things with the method of sound training, and began the study of Chinese etymology in China.
Popular literature: Fu Qian's works in the Eastern Han Dynasty, referred to as popular.
In addition, many famous annotators appeared in the Han Dynasty, such as Mao Heng, Yin Gao, Wang Yi, Zheng Xuan and Ma Rong. Among them, Zheng Xuan wrote more than one million words and was called "Zheng Xue".