This article tries to conduct research with its period of interest limited to the times from the US military government to the foundation of the Korean government in the horizontal dimension of the history of Korean language education under its awareness of the fact that work on Korean language textbooks since the National Liberation has been an important basis for the establishment of the identity and framework of the Korean language subject under the Curriculum led by the government. Existing research on sentence unit grammar knowledge has limitations that are limited to specific grammatical categories. Therefore, it is necessary to study the grammar knowledge setting and system of sentence unit grammar of the middle school grammar bulletin at the time of the US military period in that the study of grammatical texts at a certain period is rare in the horizontal dimension. In addition, the Ministry of Education and Human Resources Development (2002), which is a grammatical textbook according to the 7th curriculum, applied the textbooks of reading and grammar as an elective course for 2011 and 2015 revised curriculum, Which is the last state textbook of modern education and period at the present time. Through this study, we can see how we can distinguish between sentence unit grammar knowledge and word unit grammar knowledge, and whether the nomenclature of grammar terms we use is form-centered or syntactic-centered. It is expected that you will be able to discover one possibility that can be.