《庐山远公话》是敦煌文献中十分具有代表性的一篇作品,也是敦煌文献作品中唯一一部以“话”名篇的话本作品。话本中语言的口语化和通俗化使得它能够很好地反映唐代当时的语言面貌。以《庐山远公话》中的“为”字为研究对象,对“为”字作动词、介词、连词、助词、副词的词义及用法分类进行描写。 “Lushan Yuan dialect” is a very representative piece of Dunhuang literature, but also the only Dunhuang literary works with “words ” the famous works of this book. The colloquialization and popularization of language in the book makes it well reflect the language of the Tang Dynasty. Taking “” as the subject in “Lushan Yuan dialect” as the object of study, this paper describes the meaning and usage categories of verbs, prepositions, conjunctions, auxiliary words and adverbs of “for ”.