本文分析了厦门话[b g l]声母的声学特性,指出它们实际上是鼻冠音[mb ηg nd],而不是传统 认为的一般浊塞音和边音。在声学分析的基础上,本文进一步探讨了这些声母的历史成因,认为以厦门 话为代表的闽南方言、以及粤语、客家话、晋语等部分方言中存在的此类声母都是鼻音塞化的结果,并对 此音变的机理进行了语音学上的解释。 This paper analyzes the acoustic properties of the Xiamen dialect [b g l] consonants, pointing out that they are actually nasal coronal [mb ηg nd] instead of the traditionally considered general voiced and edge sounds. On the basis of acoustic analysis, this paper further explores the historical causes of these initials, believing that such initials as Minnan dialect represented by Xiamen dialect and some dialects such as Cantonese, Hakka and Jin dialect are nasal constriction As a result, the phonetic explanation of the mechanism of this sounding is given.