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The purpose of this study was to examine the differences in the syntactic complexity of international graduate students majoring in Korean language education compared with the syntactic complexity of Korean native speakers. The corpus of each group was constructed using academic term papers and educational journals. The results of this study are summarized as follows; the syntactic complexity of the two groups was measured in terms of sentence length and sentence extension. As a result, first, the number of words and the number of syllables per sentence of Korean native speakers were higher than those of foreign students, and there were statistical differences. We can see that Korean native speakers make longer sentences than foreign students and produce more syntactically complicated sentences. Secondly, as a result of measuring the syntactic complexity in the extended dimension of the sentence, the difference between the two groups was observed only in the number of clauses per sentence and the number of embedded clause per sentence. In order to examine the differences of the embedded clauses in detail, we divided them into noun clauses, adnominal clauses, and adverbial clauses. It is found that the complexity of sentence expansion between Korean native speakers and foreign students is due to adnominal clause and adverbial clause per sentence. In particular, it is found that the adnominal sentence has the greatest influence on the difference of syntactic complexity due to sentence expansion between the two groups. In this study, it was necessary to examine the use of the adnominal clauses in two groups. As a result of examining the types and use of patterns of the adnominal clauses used in each group, it is confirmed that foreign students can not use a variety of nouns compared to Korean native speakers.