This treatise's purpose is how we have to deal with popular song as an object of literature education. Popular song, which is conditioned by students' music environment, spreaded out to the school widely, but on the aspect of literature education the study about it is not virtually sufficient. It is not desirable that under the system of literature education popular song is introduced as a simple mean to pay students' attentions. Rather we need to recognize that popular song is an important part of literature, and that through it literature education can be much richer in contents. It requires that we should converse the perspective and category of literature that we've ever had. After the concept of western modern literature has been introduced into Korean literature about the early 20th century, there has been constant controversy concerning the concept and category of Korean literature. By 1970s, an opinion that Korean literature should include literature written in classical Chinese and oral literature, not to speak of literature written in Korean, was established, and then it drew a new idea, that is, the category of a medium of expression in literature. Since then the idea that literature has not only written language as a medium of expression but even spoken language, is generalized. So I applied this new viewpoint to all kind of arts through all ages, and divided literature itself into "written literature" and "spoken literature": The one is subdivided into literature written in classical Chinese, literature written in Korean, and picture literature (comics, etc); The other is subdivided into film literature (movie, TV drama, etc), recording literature(popular song, etc), performance literature(theater, etc), oral literature. Suppose it is reasonable, like pre-modern age's songs such as Minyo, Pansori, Sijo, popular song(exactly the words of it) can be said to be a part of literature. Subsequently, with image and rhythm(metre and rhyme) referred to as poetry's major basic characters, we can study and analyse popular song just the same as literary works. Rhythm is especially one of poetry's musical specifics, and then is expressed more strongly when it is united with song than when it is expressed by reading poem. It is very interesting that we make popular song that has ever been sung an object of literary study, and explore where an order of sound it makes and a specific sense of its rhythm come from. Through it we can find a variety of rhythmical elements, beyond the frame of a school book to analyse. On the contrary, image and metaphor of popular song have their some simple and weak structure in comparison with them of poetry. Because accepters must understand all meanings within absolute time music makes, it is very difficult for them to form a net of complex meanings by metaphor. Instead, for metaphor, a momentary strong feeling transmitted at each phrase and image's tension felt as time flows are much more important. Poetry-song's literature has been sung in pre-modern age has this common characters too. Now it is only basic step to use popular song as an important material of literature education. Above all, to develop it, we must study and analyse deeply popular song as a material of literary work, and accumulate it's results.