文章通过比对泉腔韵图《拍掌知音》与现代泉州音发现,从17世纪至今,泉州方言读书音中鼻化韵音节数目在不断增加。《拍掌知音》内部韵目之间的互补关系也显示早期泉州方言的读书音系统很可能没有鼻化韵。鼻化韵音节的产生和发展是泉州方言内部的共时变异引发的扩散式音变。 By comparing the Quanzhou rhyme map with the “clapping the palm of the hand” and the modern Quanzhou tone, the article finds that the number of nasal rhyme rhyme syllables in Quanzhou dialect is on the rise since the 17th century till now. The complementary relationship between the internal rhymes of “clapping their hands and knowing each other” also shows that the pronunciation system of early Quanzhou dialects probably has no nasalized rhyme. Nasalized rhyme syllable generation and development of Quanzhou dialect within the synchronic variation caused by the proliferation of sound.