《颜氏家训·音辞》是汉语音韵学史上最重要的文献之一。它不仅是最早的音韵学史论，而且接触和研究了一些重大的语言学课题，如方言的本质和形成原因，语言的交流和融合，标准语音和词汇标准的确立，等等。它同时还是解开《切韵》──中国第一部最成系统的韵书里许多谜团的一把钥匙。 “Yan’s Family Training · Tune Words” is one of the most important documents in the history of Chinese phonology. It is not only the earliest history of phonology, but also touches upon and studies some major linguistic topics, such as the nature and formation of dialects, the exchange and fusion of languages, the establishment of standard phonetic and lexical standards, and so on. At the same time it unlocks the “Qie Yun” - a key to many of the mysteries in China’s first most systematic rhyme book.