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.
Inspired by his senior, Jiao Hong composed Máoshī Gǔyīn Kǎo and Qūsòng Gǔyīnyì, detailing the ancient pronunciation of 650 characters using homophonic techniques.