This paper considers that content knowledge plays an important role in producing an academic text and aims to suggest a method in which Korean language learners in an academic context can build content knowledge and effectively produce an academic text. Existing knowledge of learners, intertextual knowledge gained through activities with other learners and from related texts, and knowledge obtained from the incorporation or restructuralization of intertextual knowledges or between existing knowledge and newly acquired knowledge are included in content knowledge. This paper suggests the methods of teaching Korean writing to build content knowledge, as follows. Firstly, by giving couple of authentic texts that can help learners do their writing tasks, learners can obtain intertextual knowledge needed for their writings. Secondly, by promoting interaction between teacher and learner, and among learners during the whole writing process, learners can constitute knowledge through oral communication. Lastly, through practices such as selecting and sorting, incorporating and structuralizing acquired informations, students can have knowledge-incorporated knowledge. (Korea University)