本文对广西横县那阳平话的声母、韵母、声调以及音变现象等四个方面进行了考察。文章整理出那阳平话的音系,并把它与中古音进行比较,总结出这种平话的古今演变规律,这是从历时的角度进行考察。文章第四部分主要是从共时的角度考察那阳话的语音变化情况,亦总结出一些共时规律。本文作者认为语音特点的描述最好兼顾历时的和共时的描写。 This paper examines the four aspects of consonants, vowels, tones and phonetic changes of Nanyangping dialect in Hengxian County, Guangxi Province. The article sorts out the phonology of Yang Ping dialect and compares it with the ancient Chinese phonetics to summarize the ancient and modern evolution law of this ping dialect, which is investigated from the diachronic perspective. The fourth part of the article mainly examines the phonetic variation of that Yang dialect from a synchronic perspective and summarizes some synchronic rules. The author of this article thinks that the description of phonetic features is best taken into account both diachronic and synchronic descriptions.