西夏语是11—15世纪间用表意文字记录的一种死语言,属汉藏语系羌语支。像嘉戎和木雅之类其他羌语支语言一样,西夏语动词呼应的形态变化中存在大量的元音音变现象。本文利用羌语支语言的已知情况提出了一系列假设,以构拟原始党项语中此类形态音变的起源。 Xixia language is a kind of dead language recorded by ideogram in the 11th-15th century, belonging to the Qiang language branch of the Sino-Tibetan language family. Like other Qiang languages ​​such as Jia Rong and Muya, there are a large number of vowel sound changes in the morphological changes elicited by the Xixia language verbs. In this paper, a series of hypotheses are proposed based on the known situation of the Qiang branch language to construct the origin of such morphological changes in the primitive party terms.