The purpose of this study is to analyze the grammar concept networks on major sentence constituents and to find out what grammar educational implications the results have. To do this, we constructed the relational data with the concepts that appeared in each sentence of the grammar books, indirectly and partially implemented the grammar concept networks of the expert, and analyzed the centrality of the networks. As a result, it was confirmed that there is a status difference among grammatical concepts in the grammar concept networks. And based on these discussions, we proposed the concept of ‘hub grammar concept’. In addition, it is confirmed that the type of grammar concept composing the concept network can be more detailed than the existing discussion. It was suggested that the scope of research subjects should be broadened and research methods should be diversified.