論說文既是現代文類之一，也是運用在學術研究、一般報告中最常見者。然而，根據語文學習進程、情意發展，論說文教學遠比其他文類慢。且受升學考試引導，中學以降的作文教學多傾向其他文類，亦延滯論說文的學習。當學生進入大學後，面對邏輯性、理論性、思考性兼具的論說文寫作，便難跳脫以往寫作窠臼，時錯認文類、文體，或將寫作方法等概視之。但擁有好的論說能力攸關著表達與論述之綜合能力，不容忽視。坊間對論說文的相關介紹與研究甚眾，看似全面性的背後，仍蘊有許多議題，尤其是如何將抽象原則、理論落實到教學實踐。故本文將以教學過程中，學生實際面對的寫作問題進行檢討，提出解決與教學之道，並分成三部分討論：首先，辨明文學體類特徵，這是討論結構概念與舉例的基礎；其次，聚焦最基本的兩種結構概念：「論辨型」與「三W 型」，而且配合思維，形成「閱讀」與「寫作」的雙向共建的教學模式。最後，分析例證在論說文中的學習與撰寫之道。

“The Argumentative and Expository genre” is one of the modern Writings in the Vernacular genre and often used in academic and general reports. Updated-however, according to the expression of language learning and affective order, the teaching of the Argumentative and Expository genre is slower than Other Literary Genre. Moreover, with exam based teaching writings, high school writing course are more inclined to other writing genres and hence delayed the teaching of Argumentative and Expository genres. After the students enter university, When they have to write a thoughtful, logical, theoretical Argumentative and Expository genre, it is always difficult for them to deviate from their past writing genres, and hence often taken the writing genres incorrectly or confused with the method of writing. But having a good discussion may influence on their ability of expression and discourse, hence it can not be ignored.Currently, there are many related research for the Argumentative and Expository genre, but there are still many issues that need to be further discussed. The most important thing is how the abstract theory may be implemented into the teaching. Therefore, this paper is discussing how actual teaching experience and reviewing student writing problems may offer solutions to problems and teaching methods. Therefore, this paper is discussing how actual teaching experience and reviewing student writing problems may offer solutions to problems and teaching methods. The understanding of genre is to study the structure of concepts, and examples of the fundamental. I focused on the vital discussion of the two most basic structures：”Argument form” and ”Causal form” . And with the thoughts, it will form a two way teaching of ”reading” and ”writing ”. Last, we will know how to use the examples in the Argumentative and Expository genre, including how to learn and write.