漢語辨似是訓詁學中重要的一部分，文字形音的辨似，可以有助於文獻的釋讀，而語義的區別則是影響文義正確與否的重要關鍵。藉由同義詞的辨析，可以了解每個同義詞的區別，讓語言的使用可以更加精確有層次。本文主要研究目的在透過《爾雅．釋詁》中同義詞組的分析，觀察其中所具有的漢語辨似觀念，並將《爾雅》及《爾雅注疏》辨析同義詞的方式，應用在現代漢語語義辨似，讓傳統字書中的辨似觀念及方式能為今日所用。

Chinese identified is an important part of critical interpretation of ancient texts. Syndrome differentiation of form, sound and text, can assist in the interpretation of literature, and the semantic difference is the key of the context is correct or not. Through analysis of synonyms, you can understand the differences between each synonym, and the use of language can be more precise.The main purpose of this study is analysis the synonym group through the "“Er Ya．Shi Gu” , observation the concept of the Chinese identified. And application the ways of discrimination of synonyms in Er Ya and “Er Ya．Shi Gu” used in modern Chinese Semantic Discrimination. Identified concept and the way of the traditional dictionary can be used today.