This paper focuses on the education of classical Korean poetry, especially the relationship between poetical expression and its national characteristics. There are a lot of factors which are concerned in the process of poetical expression in the classical Korean poetry. It is divided into four factors, so to speak a talent, a character, a knowledge, a practice. We have to consider the mutual relation of genres. A sphere of poetical expression has been enlarged in the process which specific genre is effected by other genres. For examples, the genres as a classical Korean poetry written by the Korean alphabet and classical Korean poetry written by a Chinese character control the method of express and subject matters. Hut they were connected in and provided new incentive each other. Therefore we can say that a sphere of poetical expression has been enlarged according as the inconsistent impulse which depends on or refuses a convention of genre. The continuity between classical Korean literature and modem Korean literature is the method which can understand the characteristic of Korean literature. To make clear the structural relationship in the poetical expression is the way to understand the flow of Korean literature. A rhythm, a structure of poetical idea and specific method of expression is the problem which is connected in classical Korean poetry and modern Korean, poetry each other.