The purpose of this study is to clarify the concepts of Kim Hui Sang’s grammar books. During “Enlightenment Korean Grammar” (after circa 1905), there were quite a few scholars who edited Korean grammar books. Among them were patriotic scholars, and teachers like Kim Hui Sang’. Kim’s ancestry is unknown. He compiled three books of “Basic Korean Grammar” in 1909, and in 1911 he merged the three books into “Joseon Grammar Book”. After 16 years, the book was re-edited as “U-Ri-Geul-Teul”. The contents of the two books are roughly the same, except for the addition and modification of some of the grammar insights. This paper can be summarized as follows: Kim Hui Sang compiled his books based on three grammatical concepts of phonology, morphology, and syntax. In the period between the early stage and the developing stage of Korean modern grammar, his grammatical concepts can be considered quite outstanding among scholars at that time.