汉语方言的材料表明,软腭辅音与硬腭过渡音具有亲和性,例如在k-等声母后面衍生-i-介音比其他声母更常见。本文用语音实验证明从软腭辅音到元音之间的自然过渡音是-i-。软腭声母与-i-介音的纽带正是-i-,即自然的过渡音转化成介音(一种具音位性的过渡音)。本文还据此对汉语语音史上的两种现象提出了新的解释。这是从演化语言学“自然变异-音系选择”的角度进行的研究。 Materials from the Chinese dialect indicate that soft palate consonants have affinity with hard palate transitions, such as derivatives of -i, which are more common than other initials after the k- et al. In this paper, the phonetic experiment shows that the natural transition from soft palate consonants to vowels is -i-. The bond between the soft palate initials and the -i-medium is -i- ie the natural transitional tone translates into an intervening (a phonetic transitional tone). Based on this, the article also gives a new interpretation of the two phenomena in the history of Chinese phonology. This is from the perspective of evolutionary linguistics “natural variation - phonology selection ” point of view.