长沙方言及周边的湘语长益片方言中,遇摄合口三等来母字的读音较为复杂,主要体现为各个字之间韵母差异较大,有时一个小韵内也有不同的读音。本文考察了该片的几个方言区以及一些历史资料,从周边方言、历史记载以及发音原理等几个角度,确定了长沙及周边湘语长益片方言遇合三等来母字读音中韵母的历史层次。 Changsha dialect and the surrounding Xiang language Changyibian dialect, the case of the mouth to take the third class mother to mother pronunciation is more complicated, mainly reflected in the different words between the vowels, sometimes a small rhyme also have different pronunciation. This paper examines several dialects of the film as well as some historical data. From the perspectives of the surrounding dialects, historical records and phonetic transcription principles, this article defines the history of vowels in Changsha and its vicinity level.