This study aims to survey the historical change of the classification of Living organisms in biology education and to make clear the contents of teaching of the classification in high school curriculum of Korea. Since 1945, the course of study in Korea can be divided into the period of syllabus (1945∼1954), the period of the course of study (1954∼1963), the period of the first curriculum (1963∼1974), the period of the second curriculum (1974∼1981), arid the period of the third curriculum (1981-until now). In accordance with each period of the curriculum, the contents of teaching and the system of classification for living organisms in high school biology textbook were examined and analyzed. As results, the contents of teaching on the classification of living organisms were connected with the fields of ecology and morphology from the period of syllabus to the period of the course of study, and were not treated as an independent unit. Taxonomy was education together with the collecting, making the samples, and the method of rearing animals. A lack of education related to the basic principle of taxonomy was noticed. From the period of the first curriculum, taxonomy was treated as an independent unit. The contents of teachings had been changed to connect more with the field of evolution. At the period of the first curriculum. the book I was encouraged to teach the basic concept of taxonomy, and the book II was to teach concretely the classification groups. But in practice it on the textbooks, the contents of teaching were overlapped in the book I. and II with much confusion. However, at the period of the third curriculum, the taxonomy field was all integrated and was encouraged to teach only in the book I. At the period of the second curriculum, especially, the contents of teaching on the basic theory of classification were omitted. Therefore, most of the textbooks demonstrated it in the unit of kingdom Plantae. At the period of the third curriculum, the contents of teaching on basic theory of the classification mere inserted in the unit of the abstract of the classification to comprehend the Basic concepts of the classification. In the textbook living organisms were classified into two kingdoms, Plantae and Animalia, in the period of the first curriculum, and were divided into three kingdoms, adding Protista, since the period of the second curriculum. Textbooks of each period had a various number of classification groups. It required to correct the mistake, that virus seas included in the group of bacteria, and the Conjugate was treated as an independent ph ylum of the Chlorophyta. In some textbooks and in period of the second and shire curricula, the classification groups including the kingdom Protista appeared repeatedly in the kingdoms Plantae and Animalia, which seemed to be a particular trial to understand the connection of the three kingdoms taxonomically. Terminology on the classification groups had been confused fer a long period. However it became, satisfactorily stable in the current textbooks. Taxonomy is a basic knowledge of the biology, as well as to teach how the living organisms are related phylogenetically in course of evolution. Therefore, the classification system may be different according to investigators, and a careful guidance should he prepared to introduce them without mistake.