变读是晋语的重要构词特征之一 ,向为晋语研究者所重视。文章在过去探讨晋语变读类型、性质的基础上 ,进一步论述“变读”的成因 ,旨在确立并凸现变读在晋语中的地位和价值。文章认为语言经济性原则 ,不同历史时期、不同空间层次的语音叠置 ,不同的句法位置对词语不同程度的语音碾磨 ,“合音固化”等均是产生变读的原因。 The change of reading is one of the important features of Jin language, which is paid more attention to by Jin researchers. On the basis of the discussion of the types and nature of Jin language transliteration in the past, the essay further discusses the causes of “change reading” to establish and highlight the status and value of the change in Jin language. The article holds that the principle of language economy, different historical periods, different spatial levels of voice overlay, different syntactic positions on the words of different degrees of voice grinding, “Harmony” and so are the reasons for the change.