[摘要]《世说新语》是魏晋南北朝时期刘义庆撰写的一部志人笔记体小说，具有极高的文学价值，是研究南北朝时期汉语词汇、语法发展的重要语料。“於”“于”“在”是古汉语中的常用虚词，也是《世说新语》中的常用介词，随着语言的发展，三个介词的用法此消彼长，体现了中古时期介词发展变化的趋势。本论文通过搜集资料，以余嘉锡的《世说新语笺疏》为依据在前人的基础上，对《世说新语》中的“於”“于”“在”三个介词进行统计分析，概括出三个介词的不同用法。

[关键词]《世说新语》 介词  於 于 在 用法 意义

[Abstract]Shi Shuo Xin Yu is a type of literature consisting mainly of short sketches written by Liu Yiqing of the Northern and Southern Dynasties which has a very high literary value. It is the important corpora on the study of Chinese vocabulary and grammar development in the Northern and Southern Dynasties. "Yu"、"Yu" and "Zai" are the ancient Chinese common function words, and they are also the common preposition in Shi Shuo Xin Yu. With the development of language, the usage of  the three prepositions changes，which reflects the trend of the development of the prepositions in the medieval period. In this paper, through the collection of data, on the basis of Yu Jiaxi's Shi Shuo Xin Yu Notes and under the aid of predecessorsˊstudy outcome, on the three prepositions of the "Yu" 、"Yu " and "Zai " in The Shi Shuo Xin Yu for statistical analysis in order to summarized the different usages of the three prepositions.

[Key words] Shi Shuo Xin Yu  preposition  ”Yu”  ”Yu”  ”Zai”  usage  meaning