China's poems have always had rhyme. Although it was not until the Southern and Northern Dynasties that China discovered the difference between initials and finals from the input of Sanskrit, their ancestors still sang rhyming poems with harmonious rhythm at the source of poems such as The Book of Songs and Songs of the South. The primary schools in Ming and Qing Dynasties can sort out the overall changes of China's national language and pronunciation since the pre-Qin period, and rhyming poems have contributed a lot.