本文采用真实时间观察和显象时间观察的语言变异研究方法,考察了近三十年来西部苗语的语音变化,发现其呈现出一系列有规则的语音变异并已经导致音系裂变。通过和苗语其他方言土语的比较,认为西部苗语的语音变异是语音变化的方向,将来很可能会形成新的方言土语。 In this paper, we use the method of real-time observation and temporal observation of language variation to examine the phonetic variation of western Miao in the past three decades and find that it exhibits a series of regular phonetic variations that have led to the phonological fission. Through the comparison with other dialects of Hmong dialect, the author thinks that the variation of voices in western Miao language is the direction of phonetic change and it is likely to form new dialect native dialect in the future.