本文通过对《切韵》以及与《切韵》时代相近的一些重要反切资料中轻重唇音混切的实质进行全面考察,指出所谓的轻重唇音混切,实质上是轻唇字大量地作为重唇字的反切上字,而重唇字很少作为轻唇字的反切上字,因此当时轻重唇音已经分化。根据词汇扩散理论,这些作为反切上字的轻唇字,在当时可能有轻重唇两读。 In this paper, a comprehensive examination of the essence of the lip-tonal lipsticks in “Qieyun” and some important anti-tipping materials similar to the “Qieyun” era points out that the so-called light-weight lip- The word inverse of the word, and heavy lips rarely used as a light lip words on the reverse cut, so the severity of the lip has been divided. According to the theory of lexical diffusion, these light lip words, which are anti-cut letters, may have both light and heavy lips reading at that time.