纳西语东部和西部两个方言的差异造成了纳西语语支归属的不同分类。国内学者认为应归属彝语支,国外学者中有人认为西部方言应归彝语支,东部方言应归西夏语支(或羌语区)。本文把纳西语与彝语、羌语作比较,认为两种方言之间不仅有严整的音韵对应,而且同源词占60～70％。摩梭话(东部方言)与羌语的同源词只占26.9％,与彝语的同源词占40.7％。因此,从族源和方言两方面看,纳西语归入彝语支是合理的、科学的。 The differences between the two dialects of the Naxi language in the eastern and western parts of the Naxi language lead to different classification of the Naxi language. Some domestic scholars think that the Yi dialect should be attributed to the Yi language branch. Some scholars abroad think that the western dialect should be owned by the Yi language branch and the eastern dialect should be under the Xixia language branch (or the Qiang language region). This article compares Naxi language with Yi language and Qiang language, and thinks that there is not only a strict phonetic correspondence between the two dialects, but also cognate words account for 60-70%. Mosuo dialect (eastern dialect) and the Qiang language only occupy 26.9% of homophones, and Yi language homonym 40.7%. Therefore, from the ethnic origin and dialect terms, Naxi classified Yi branch is reasonable and scientific.