Kim Jungsu In this research, the implications of the education of classification of lexicon phase are found by analyzing the students’s questions. The results are as follows. First, textbooks and theoretical books do not elaborate on tne definition of classification of lexicon phase. Second, students need more than explanation and examples from textbooks. Third, students are curious about the reason why the lexicon phases take different forms. These are suggestions for the education of classification of lexicon phase. First, the teachers should prepare a myriad of vocabulary materials for students to analyze and to classify the lexicon phases. Second, the teachers should design the class to understand the principles of the generation and loss of the vocabulary. Third, the teacher should construct the class to improve the students’ practical language.