Immigrant slogans rhyme.

It doesn't have to be so complicated upstairs.

In ancient times, it may be more complicated and not uniform.

Later, poetry was introduced into the imperial examination, and later poetry became a compulsory item in the imperial examination, and gradually a unified rhyme book was produced to rhyme poetry.

The earliest rhyme book is Qieyun written by Lu Fayan in Sui Dynasty, which is divided into 206 rhymes. In the Tang dynasty, it was simplified and reorganized into Tang rhyme, and it was not until the Qing dynasty that it was officially used as the standard for imperial examinations and scholars' poetry writing. So until 1949, the rhyme of poetry was based on Tang rhyme, regardless of dynasty and region, for thousands of years.

However, the rhyme book used later was Ping Shui Yun compiled by the Song Dynasty, which combined the same rhyme feet into 107 rhyme feet according to the rhyme of the Tang Dynasty. At the same time, the new rhyme of Pingshui written by Shanxi Pingshui official Jin is 106 rhyme, and the rhyme of Pingshui was merged into 65436 rhyme in Peiwen Rhyme House compiled in the Kangxi period of Qing Dynasty. At present, professionals still write poems according to Pingshui rhyme instead of Chinese Pinyin.

Ping Shui Yun only consolidated and edited Tang Yun, and did not change the words. Therefore, from the Southern and Northern Dynasties to 1949, the rhyme of the poet is consistent, and the subtle differences are almost negligible.