「成語」在中文裡應用極為廣泛，本文自語法、修辭和語文教學的角度皆吸探究成語的意義、語句結構和修辭技巧，並提出成語的教學原則及方法。研究結果顯示：在語法方面，成語的結構有短語、單句、兼語句、複句、倒序句和省略句這兩種特殊句式。在修辭方面，成語運用的技巧分別有摹況、譬喻、轉化、映襯、借代、對偶、排比、類疊、頂真、回文、鑲嵌、倒裝、誇飾、婉曲、析徵、節縮、互文、轉品、藏詞十九種。在教學方面，成語的教學應當把握生動化、統整化、實用化與多樣化四個原滿院；一些具體可行的教學方式，如：成語尋寶、成語接龍、成語填字、成語配對、說成語故事、成語造句、用數字猜成語、成語形象畫圖等，均是良方。

　　　　　Idioms were used widely in Chinese. This thesis based on the viewpoint of grammar, rhetoric and the teaching methods to study idioms. The results of research as followings: Primary from the viewpoint of grammar, there are five types of formation in Chinese idioms, which are phrases, single sentences, complex sentences, pivotal sentences and special sentences. Secondly form the viewpoint of rhetoric of instruction, four principles must be adopted, and the suitable teaching methods are finding the named words in idioms, idioms-joint, searching antithetical couplet with idioms, speaking the story of idioms, to stuff the blanks concerning idioms, making sentences with idioms, to guess the answer of the riddle about idioms.