中文摘要：

对段玉裁的训注“古今字”,目前已有不少研究成果,主要是围绕其古今字材料的具体内容进行字际关系的分类,或是对其“古今字”界定进行分析。其实段玉裁的“古今字”研究已经不限于单纯的训诂目的,而着重关注词语用字的历时变化,并从多角度探讨古今用字变化的理据和原因。可见段玉裁的“古今字”研究蕴含了字用学的某些理念,使“古今字”研究具有了理论研究价值。

英文摘要：

＂Gu Jin Zi＂ （古今字） is usually referred to the ancient and modem Chinese characters that people ever used. For now, there are already lots of works about Duan Yu-cai（段玉裁）＇ s ＂Gu Jin Zi＂ （古今字）, most of them focused on the inter Chinese characters relation or the definition of ＂Gu Jin Zi＂ （古今字）.In fact, Duan＇ s study on ＂Gu Jin Zi＂ （古今字） does not limited to purely exegetical purposes. The historical changes of words ＇ writing forms, and the justifications to these changes absolutely weighted more in Duan＇ s ＂Gu Jin Zi＂ （古今字） study. We can tell that Duan＇ s ＂Gu Jin Zi＂ （古今字） contained the theory of how words use Characters to record their meanings, which reflected his unique academic pursuits. The theory of the writing forms of a word are the reason why Duan were better than their predecessors in ＂Gu Jin Zi＂ （古今字） study . This article would discuss his theoretical achievements on the theory of words＇ writing forms.