Starting from the musical characteristics of stage singing, Li Yu holds the view of rhyming which abides by the Qu-rhyme, coordinates between music and rhyme, and uses pure rhymes. Although Li Yu did not compile a special book on the rhyme of Nanqu, he still formed a distinctive three-level Qu-rhyme system. Li Yu’s system is similar to that of Mao Xianshu’s Nan Qu Zheng Yun, and both of them show the characteristics of rhythm based on melody and a combination of northern and southern rhythms. Their views on Qu-rhyme are different but interlinked. They inherit and develop the ideas of Qu-rhyme of the previous generation, which is not a simple continuation of the different views on the use of rhyme of Nanqu in the early and late Ming Dynasty.