在上古音研究中,内部拟测法发挥了非常重要的作用,为上古音的研究开拓了一条新的道路。然而音韵学家在使用这种方法时,只看到它的优点———能够对远古的语音进行重建;但对它的固有缺陷却视而不见。本文试图从《切韵》音系的性质看内部拟测法的局限性。 In the studies of ancient Chinese sounds, the internal quasi-method has played a very important role and opened up a new road for the study of the ancient sounds. Phonologists, however, use this method only to see its merit - to reconstruct ancient speech; but to ignore its inherent flaws. This article attempts to look at the limitations of the internal quasi-test from the nature of the “Qieyun” phonology.