Encouraged by his senior, Jiao Hong (焦竑) (1540–1620), he wrote Máoshī Gǔyīn Kǎo (毛詩古音考) and Qūsòng Gǔyīnyì (屈宋古音義), in which he shows the ancient pronunciations (by homophones) of 650 characters.
Encouraged by his senior, Jiao Hong penned Máoshī Gǔyīn Kǎo and Qūsòng Gǔyīnyì, elucidating the ancient pronunciation of 650 characters through homophonic relationships.