用反切的原理进行训诂，是先秦两汉长期使用的一种声训方法，清代学者对此有所揭示，现代训诂学著作却阙而不论。本文对这种切语声训的原因、历史、表达方式和音理构造作一简略的分析，并认为，切语声训的音理构造和出现时代，是反切起源于上古汉语合音的证据之一。 The principle of anti-cutting is used in the pre-Qin and the Han dynasties as a method of phonological training which has been used for a long time by scholars in Qing Dynasty. This article makes a brief analysis of the reasons, history, expressions and phonological structure of the phonetic meanings of this paraphrase, and concludes that the phonetic structure and appearance times of the phonetic transcription of the phonetic meanings are the evidence of the anti-tangent originating from the cohesion of the ancient Chinese one.