本文從語法的觀點，探討《論語》中「斯」字的詞性用法。「斯」字本義是「析」義，是劈裂、析分的意思，作動詞使用，小篆中的「斯」是一個形聲字。而本文探討之先秦時代《論語》中所見的「斯」字，當作代詞或連詞使用，在《論語》正文二十篇（除《陽貨篇》外）皆有出現，處於共四十五章七十個句子中，共計有七十一個。本文參考眾多學者對於「斯」字的說解，斟酌損益，逐一探討先秦時代《論語》中的「斯」字。通過研究更加深入地瞭解先秦時代《論語》中「斯」字的語法功能、詞性與用法，通過與《重編國語辭典》的比較，發現在先秦時期「斯」字的用法已經逐漸開始分化、語義成形，奠定了漢語中「斯」字用法的基礎。

From the angle of grammar，this paper study on the part of speech， the grammatical functionand and the usage about the word「斯」in the Analects 。The original meaning of the word「斯」is「析」，means split and analysis，is used as a verb，the word「斯」is a phonogram as Xiao Zhuan。But to be discussed in this paper，the word「斯」in the Analects in the pre Qin period is used as a pronoun or a conjunction，has appeared in twenty chapters expect the Chapter Yang Huo in the Analects，in seventy sentences of forty-five chapters， a total of seventy-one。This paper，reference to many scholars studying on the word「斯」，consider the gains and losses，study one by one on the word「斯」in the Analects in the pre Qin period。Through the study，more in-depth understanding of the part of speech，the grammatical function and the usage about the word「斯」in the Analects in the pre Qin period。Through the comparison with the Reprogramming Mandarin Dictionary，the word「斯」of the pre Qin period is found that the usage has gradually began to differentiate，semantic forming，which laid the foundation on the usage of the chinese word「斯」。